Display device

ABSTRACT

A display device is disclosed. The display device includes a housing, a roller located within the housing, a display panel having a front surface for displaying a screen and a back surface facing the front surface, the display panel being wound on the roller, and a plate wound on the roller, and coupled to back surface of the display panel, the plate having an opening.

Pursuant to 35 U.S.C. § 119(a), this application claims the benefit of earlier filing date and right of priority to Korean Patent Application No. 10-2017-0123638, filed on Sep. 25, 2017, the contents of which are hereby incorporated by reference herein in its entirety.

BACKGROUND OF THE INVENTION Field of the Invention

Embodiments of the invention relate to a display device.

Discussion of the Related Art

As the information society develops, demand for display devices is increasing in various forms. Recently, in response to this, various display devices such as a liquid crystal display (LCD), a plasma display panel (PDP), an electro luminescent display (ELD), and a vacuum fluorescent display (VFD) have been studied and used.

Among them, a display device using an organic light emitting diode (OLED) has an advantage that it has excellent luminance characteristics and viewing angle characteristics compared to the liquid crystal display. Since the display device does not require a backlight unit, the display device has an advantage that it can be implemented as an ultra-thin type.

SUMMARY OF THE INVENTION

In one aspect, there is provided a display device including a housing, a roller located within the housing, a display panel having a front surface for displaying a screen and a back surface facing the front surface, the display panel being wound on the roller, and a plate wound on the roller, and coupled to back surface of the display panel, the plate having an opening.

The plate may include a metal material.

The plate may include a plurality of holes, and the plurality of holes may be spaced along a longitudinal direction of the roller.

The plate may include a plurality of holes, and the plurality of holes may be spaced along a direction in which the plate is wound on the roller.

The plate may include a plurality of holes, and the plurality of holes may be spaced along a direction perpendicular to the longitudinal direction of the roller.

The plurality of holes may be slits which are elongated along the longitudinal direction of the roller.

The display device may further include an adhesive layer formed on the back surface of the display panel. The plate may be attached to the adhesive layer.

The plate may include a second front surface attached to the back surface of the display panel and a second back surface facing the second front surface. The second back surface may contact an outer circumference surface of the roller.

The front surface of the display panel may contact an outer circumference surface of the roller.

The plate may include a front surface coupled to the back surface of the display panel and a back surface facing the front surface. The display device may further include a first resin layer coupled to the back surface.

The first resin layer may include a portion located at the opening of the plate.

The plate may be accommodated in the first resin layer.

The display panel may be accommodated in the first resin layer.

The display device may further include a second resin layer coupled to the back surface of the display panel. The plate may be disposed between the first resin layer and the second resin layer.

The first resin layer may include a material of urethane or rubber.

The display device may further include a third resin layer coupled to the back surface of the display panel. The plate may be accommodated in the third resin layer.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention. In the drawings:

FIGS. 1 to 18 are views illustrating configuration of a display device related to the invention;

FIGS. 19 to 34 are views illustrating a display device according to an embodiment of the invention;

FIGS. 35 to 57 are views illustrating a display device according to another embodiment of the invention; and

FIGS. 58 to 88 are views illustrating a display device according to the other embodiment of the invention.

DETAILED DESCRIPTION OF THE EMBODIMENTS

Reference will now be made in detail embodiments of the invention examples of which are illustrated in the accompanying drawings. Since the invention may be modified in various ways and may have various forms, specific embodiments are illustrated in the drawings and are described in detail in the present specification. However, it should be understood that the invention are not limited to specific disclosed embodiments, but include all modifications, equivalents and substitutes included within the spirit and technical scope of the invention.

The terms ‘first’, ‘second’, etc. may be used to describe various components, but the components are not limited by such terms. The terms are used only for the purpose of distinguishing one component from other components. For example, a first component may be designated as a second component without departing from the scope of the invention. In the same manner, the second component may be designated as the first component.

The term “and/or” encompasses both combinations of the plurality of related items disclosed and any item from among the plurality of related items disclosed.

When an arbitrary component is described as “being connected to” or “being linked to” another component, this should be understood to mean that still another component(s) may exist between them, although the arbitrary component may be directly connected to, or linked to, the second component. In contrast, when an arbitrary component is described as “being directly connected to” or “being directly linked to” another component, this should be understood to mean that no component exists between them.

The terms used in the present application are used to describe only specific embodiments or examples, and are not intended to limit the invention. A singular expression can include a plural expression as long as it does not have an apparently different meaning in context.

In the present application, the terms “include” and “have” should be understood to be intended to designate that illustrated features, numbers, steps, operations, components, parts or combinations thereof exist and not to preclude the existence of one or more different features, numbers, steps, operations, components, parts or combinations thereof, or the possibility of the addition thereof.

Unless otherwise specified, all of the terms which are used herein, including the technical or scientific terms, have the same meanings as those that are generally understood by a person having ordinary knowledge in the art to which the invention pertains. The terms defined in a generally used dictionary must be understood to have meanings identical to those used in the context of a related art, and are not to be construed to have ideal or excessively formal meanings unless they are obviously specified in the present application.

The following exemplary embodiments of the invention are provided to those skilled in the art in order to describe the invention more completely. Accordingly, shapes and sizes of elements shown in the drawings may be exaggerated for clarity.

As the information-oriented society is developed, needs for the display device are increased in various forms. In line with the needs, recently, various display devices, such as a liquid crystal display device (LCD), a plasma display panel (PDP), an electro-luminescent display (ELD), and a vacuum fluorescent display (VFD), are researched and used.

From among them, a display device using organic light-emitting diodes (OLED) has advantages that it has an excellent brightness characteristics and viewing angle characteristics compared to the LCD and it can be implemented in an ultra-thin type because it does not need a backlight unit.

Furthermore, a flexible display may be bent or wound on a roller. A display device spread on the roller or wound on the roller, if necessary, may be implemented using the flexible display. In this case, there is a problem in stably winding or retracting the flexible display on the roller or in stably unwinding or extending the flexible display from the roller.

An organic light emitting diode (OLED) display is hereinafter described as an example of a display panel, but the display panel that may be applied to the present disclosure is not limited to a liquid crystal panel and may include a liquid crystal display (LCD), a plasma display panel (PDP), and a field emission display (FED).

As shown in FIG. 1, hereinafter, a display device 100 may include a first long side LS1, a second long side LS2 opposite the first long side LS1, a first short side SS1 neighboring the first long side LS1 and the second long side LS2, and a second short side SS2 opposite the first short side SS1.

The first short side area SS1 may be called a first side area. The second short side area SS2 may be called a second side area opposite the first side area. The first long side area LS1 may be called a third side area that neighbors the first side area and the second side area and that is located between the first side area and the second side area. The second long side area LS2 may be called a fourth side area that neighbors the first side area and the second side area, that is located between the first side area and the second side area, and that is opposite the third side area.

Furthermore, for convenience of description, the length of the first and the second long sides LS1 and LS2 has been illustrated as being longer than that of the first and the second short sides SS1 and SS2, but the length of the first and the second long sides LS1 and LS2 may be approximately the same as that of the first and the second short sides SS1 and SS2.

Furthermore, hereinafter, a first direction DR1 may be a direction parallel to the long sides LS1 and LS2 of the display device 100, and a second direction DR2 may be a direction parallel to the short sides SS1 and SS2 of the display device 100.

A third direction DR3 may be a direction perpendicular to the first direction DR1 and/or the second direction DR2.

The first direction DR1 and the second direction DR2 may be collectively referred to as a horizontal direction. Furthermore, the third direction DR3 may be called a vertical direction.

From another aspect, a side of the display device 100 on which an image is displayed may be called a front or a front surface. When an image is displayed on the display device 100, a side on which an image cannot be viewed may be called a back or a back surface. When the display device 100 is viewed from the front or the front surface, the first long side LS1 may be called an upper side or a top surface. In the same manner, the second long side LS2 may be called a lower side or a bottom surface. In the same manner, the first short side SS1 may be called a left side or a left surface, and the second short side SS2 may be called a right side or a right surface.

Furthermore, the first long side LS1, the second long side LS2, the first short side SS1, and the second short side SS2 may be referred to as edges of the display device 100. Furthermore, points at which the first long side LS1, the second long side LS2, the first short side SS1, and the second short side SS2 are met may be referred to as corners. For example, the point at which the first long side LS1 and the first short side SS1 are met may be a first corner C1. The point at which the first long side LS1 and the second short side SS2 are met may be a second corner C2. The point at which the second short side SS2 and the second long side LS2 are met may be a third corner C3. The point at which the second long side LS2 and the first short side SS1 are met may be a fourth corner C4.

In this case, a direction from the first short side SS1 to the second short side SS2 or a direction from the second short side SS2 to the first short side SS1 may be called a left-right direction LR. A direction from the first long side LS1 to the second long side LS2 or a direction from the second long side LS2 to the first long side LS1 may be called an up-down direction UD.

An +x-axis direction may be referred to as a right direction or a right-side direction or a right surface direction. A −x-axis direction may be referred to as a left direction or a left-side direction or a left surface direction. A +y-axis direction may be referred to as an upper direction. A −y-axis direction may be referred to as a lower direction. A +z-axis direction may be referred to as a front direction or a front-side direction or a front surface direction. A −z-axis direction may be referred to as a back direction or a backside direction or a back surface direction.

The x-axis direction may be parallel to the first direction. The y-axis direction may be parallel to the second direction. The z-axis direction may be parallel to the third direction.

Referring to FIG. 2, a display device 100 according to an embodiment of the present disclosure may include a display portion 20 and a housing 30.

The display portion 20 may include a display panel 10 and a module cover 15. The display panel 10 is provided in the front surface of the display device 100, and an image may be displayed on the display panel 10. The display panel 10 may divide an image into a plurality of pixels, and may display the image by controlling the pixels so that the pixels emit light in accordance with color, brightness, and chroma for each pixel. The display panel 10 may be divided into an active area on which an image is displayed and an inactive area on which an image is not displayed.

If the display panel 10 has flexibility, it may be referred to as a flexible display panel 10.

The display panel 10 may have a rectangle, but is not limited thereto. The display panel 10 may have a shape having specific curvature at a corner. The display panel 10 may be an OLED panel, but is not limited thereto. For example, the display panel 10 may be an LCD panel.

The module cover 15 may be provided in the back surface of the display panel 10. The module cover 15 may be directly attached to the display panel 10. The module cover 15 may have a size equal to or greater than the size of the display panel 10.

The module cover 15 may support the back surface of the display panel 10. Accordingly, the module cover 15 may include a material which is light and has high strength. For example, the module cover 15 may include an aluminum or stainless material.

The housing 30 may be provided in the back surface of the display portion 20. That is, this means that the housing 30 may be provided in the back surface of the module cover 15. The housing 30 may shield at least one PCB. That is, this means that the housing 30 may cover at least one PCB attached to the back surface of the module cover 15. A detailed coupling structure and method of at least one PCB is described later.

Electromagnetic waves emitted by at least one PCB may be transferred to the housing 30. Accordingly, although not shown, the housing 30 may include an inner housing that is made of a conductive material and an outer housing that covers the inner housing. However, the present disclosure is not limited thereto. For example, the housing 30 may be made of a single conductive material.

Referring to FIG. 3, in the display device 100 according to an embodiment of the present disclosure, the housing 30 may be located under the display portion 20. More specifically, the housing 30 may have a shape that surrounds the lower portion of the display portion 20. The housing 30 may have several driving devices or driving circuits disposed therein not exposed to the outside.

A width of the housing 30 in the first and the third directions may be greater than that of the display portion 20 in order to protect the display portion 20 within the housing 30. A width of the housing 30 in the second direction may be smaller than that of the display portion 20.

In the display device 100 according to an embodiment of the present disclosure, the housing 30 may not be located in the active area of the display portion 20.

Referring to FIG. 4, the display device 100 according to an embodiment of the present disclosure may have a first state in which the active area of the display portion 20 is located within the housing 30 and a second state in which the active area of the display portion 20 is exposed outside the housing 30.

When the display device 100 is the first state, the active area of the display portion 20 may be located within the housing 30. That is, this means that the display portion 20 may be shielded by the housing 30.

When the display device 100 is the second state, the active area of the display portion 20 may be exposed outside the housing 30. That is, this means that when the display portion 20 is the second state, at least some of the display portion 20 may be protruded upward from the housing 30.

Although not shown, the display portion 20 may change from the first state to the second state by a roller located within the housing 30. More specifically, the display portion 20 may change from the first state in which it has been wound by the roller to the second state in which the display portion 20 has been unwound and exposed to the outside by the roller. To the contrary, when the roller is unwound and wound, the display portion 20 may change from the second state to the first state. A detailed structure and operating method of the roller and the display portion 20 are described later.

In the display device 100 according to an embodiment of the present disclosure, the display portion 20 may have any one of the first state and the second state. Accordingly, the display portion 20 may be exposed outside the housing 30 only when the display device 100 is used, and thus an occupied space may be reduced when not in use.

Referring to FIG. 5, in the display device according to an embodiment of the present disclosure, a panel roller 143 may be connected to one end of the display panel 10. The panel roller 143 may wind or unwind the display panel 10 so that the display panel 10 has any one of the first state and the second state. The panel roller 143 may also be referred to as the roller 143.

In the display device according to an embodiment of the present disclosure, at least one source PCB 120 may be located in at least part of the front surface of the display panel 10. The one or more source PCBs 120 may be spaced apart from each other.

Signal lines for transmitting digital video data and timing control signals transmitted by a timing controller board 105 may be located in the at least one source PCB 120. The source PCB 120 may be connected to the display panel 10 by a source chip on film (COF) 123. The source COF 123 connected to one side of the source PCB 120 may be extended to the active area of the display panel 10 and connected to the display panel 10.

A seating portion 379 may be located in the outer circumference of the panel roller 143. The seating portion 379 may form an accommodation space B by stepping part of the outer circumference of the panel roller 143. As the panel roller 143 is wound, the source PCB 120 may be located in a portion of the seating portion 379 where the source PCB 120 comes into contact with the panel roller 143. The seating portion 379 may have a shape in which at least part of the outer circumference of the panel roller 143 has been depressed.

When the panel roller 143 is wound, the source PCB 120 may be accommodated in the accommodation space B of the seating portion 379. Accordingly, although the panel roller 143 is wound, there may be no damage to the source PCB 120.

The timing controller board 105 may be disposed within the panel roller 143. An FFC cable 117 (e.g., a flexible flat cable) electrically connects the timing controller board 105 and the source PCB 120.

The panel roller 143 may include an upper panel roller 331 and a lower panel roller 337. The upper panel roller 331 and the lower panel roller 337 may be coupled together by a screw. The timing controller board 105 may be disposed between the upper panel roller 331 and the lower panel roller 337. The screw may combine the upper panel roller 331, the lower panel roller 337, and the timing controller board 105. The FFC cable 117 may be connected to the timing controller board 105 and the source PCB 120 through a hole 331 a located in the upper panel roller 331.

In the display device according to an embodiment of the present disclosure, the FFC cable 117 may not be entangled because the timing controller board 105 is rotated along with the panel roller 143. Furthermore, the space can be reduced because the timing controller board 105 is disposed within the panel roller 143.

Referring to FIG. 6, in the display device according to an embodiment of the present disclosure, the timing controller board 105 may be disposed in the panel roller 143 on one side of the central part of the housing 30 on which the display panel rises and fall, and a main board 109 and a power supply 107 may be located on the other side of the central part of the housing 30.

The timing controller board 105 may be connected to the main board 109 and the power supply 107. The timing controller board 105 may be connected to the main board 109 and the power supply 107 through a wiring electrode. The wiring electrode may include a first wiring electrode 307 that connects the timing controller board 105 and the power supply 107 and a second wiring electrode 309 that connects the timing controller board 105 and the main board 109.

For example, a plurality of the first wiring electrodes 307 may be used. Furthermore, the first wiring electrode 307 may have a circle. The first wiring electrode 307 may connect the timing controller board 105 and the power supply 107 through the opening portion of the central part of the pivot of the panel roller 143.

The FFC cable 117 by which the timing controller board 105 and the source PCB 120 are connected may be used as the second wiring electrode 309. The second wiring electrode 309 may connect the timing controller board 105 and the main board 109 through the opening portion of the central part of the pivot of the panel roller 143.

The first wiring electrode 307 and the second wiring electrode 309 may be located on the opposite sides of the timing controller board 105. The opening portion through which the first wiring electrode 307 passes and the opening portion through which the second wiring electrode 309 passes may be located on opposite sides.

In the display device according to an embodiment of the present disclosure, the timing controller board 105 is disposed in the panel roller 143, and the power supply 107 and the main board 109 may be located on the opposite sides of the display panel. Accordingly, there is an advantage that the space within the housing 30 can be reduced.

Referring to FIG. 7, the display device according to an embodiment of the present disclosure may include the panel roller 143, a motor assembly 137, and a link 73 within the housing 30.

The link 73 may also be referred to as a support portion 73.

The module cover 15 may include a plurality of segments 15 a. The segment 15 a may also be referred to as an apron.

The panel roller 143 may be located at the front based on a portion on which the display portion 20 of the housing 30 rises or falls. The panel roller 143 may wind the display panel 10 and the module cover 15 at the same time.

The link 73 may be installed on the housing 30. The link 73 may function to support the display panel 10 and the module cover 15 so that they rise or fall. The link 73 may raise or drop an upper bar 75 connected to the upper part of the module cover 15 and the display panel 10.

The display portion 20 may have a top connected to the upper bar 75 and a bottom connected to the panel roller 143. A portion between the top and bottom of the display portion 20 may be easily bent. The link 73 may support the module cover 15 in the back surface of the module cover 15 so that the module cover 15 is not bent.

The motor assembly 137 may be located in a portion to which the link 73 is connected. The motor assembly 137 may drive the link 73 so that the link rises or falls. The motor assembly 137 may receive an electrical signal and convert it into a physical force. The motor assembly 137 may change the link 73 from the first state to the second state by transferring rotating energy to the link 73. A detailed structure and driving principle of the motor assembly 137 are described later.

A guide bar 234 may be located at an entrance 30 a through which the link 73 rises or falls into the housing 30. The guide bar 234 may include first and second guide bars 234 a and 234 b. The entrance 30 a of the housing 30 may be formed between the first and the second guide bars 234 a and 234 b. The first and the second guide bars 234 a and 234 b may face each other with the link 73 interposed therebetween. For example, the first guide bar 234 a may be located at the back of the link 73, and the second guide bar 234 b may be located at the front of the link 73.

The display device according to an embodiment of the present disclosure may wind the display panel 10 and the module cover 15 at the same time using a single roller. Accordingly, the thickness of the housing 30 can be reduced.

Referring to FIG. 8, the segment 15 a may have a rectangle. The segments 15 a may be separated in the y-axis direction, and may be attached to the back surface of the display panel 10. The module cover 15 includes the plurality of segments 15 a and may be wound or unwound by the roller. The module cover 15 may include a plastic or aluminum material. Accordingly, the module cover 15 can protect the display panel 10 against an external impact.

The display panel 10 and the module cover 15 may be combined through adhesive layers 70. The adhesive layer 70 may be a double-sided tape. The module cover 15, together with the display panel 10, may be wound on by the adhesive layers 70. The adhesive layers 70 may be located on the segments 15 a and attached to the display panel 10. The adhesive layers 70 may have been spaced apart from each other. Accordingly, the shape of the module cover 15 may be easily changed when the module cover 15 is wound or unwound by the roller. If the width of the adhesive layer 70 in the second direction becomes thin, the display panel 10 is not wrinkled and may be naturally unwound from or wound on the panel roller 143.

Furthermore, as the width of the segment 15 a in the second direction increases, the segment 15 a can stably support the display panel 10 due to enhanced stiffness.

If the width of the adhesive layer 70 in the second direction is 30% or less of the width of the segment 15 a in the second direction, the wrinkling of the display panel 10 can be reduced because an external force is less applied to the display panel 10.

Furthermore, if the width of the adhesive layer 70 in the second direction is 15% or more of the width of the segment 15 a in the second direction, the wrinkling of the display panel 10 can be significantly reduced because the stiffness of the display panel 10 is improved.

Furthermore, as the width of the adhesive layer 70 in the third direction increases, the display panel 10 may be less deformed with respect to an external force. More specifically, as the width of the adhesive layer 70 in the third direction increases, the display panel 10 and the module cover 15 can be stably attached due to enhanced flexibility.

Furthermore, as the width of the segment 15 a in the third direction decreases, the wrinkling of the display panel 10 can be reduced. More specifically, as the width of the segment 15 a in the third direction decreases, the wrinkling of the display panel 10 can be reduced due to enhanced stiffness.

Accordingly, if the width of the adhesive layer 70 in the third direction is 3% or more of the width of the segment 15 a in the third direction, the wrinkling of the display panel 10 can be significantly reduced because the stiffness of the display panel 10 is enhanced.

Furthermore, if the width of the adhesive layer 70 in the third direction is 6% or less of the width of the segment 15 a in the third direction, the wrinkling of the display panel 10 can be significantly reduced because the stiffness of the display panel 10 is increased.

In the display device according to an embodiment of the present disclosure, the module cover 15 includes the plurality of the segments 15 a, and the adhesive layers 70 may be located on the segments 15 a, respectively.

Referring to FIGS. 9 and 10, in the display device according to an embodiment of the present disclosure, the module cover 15 and the display panel 10 may be coupled to the upper bar 75. The module cover 15, the display panel 10, and the upper bar 75 may be coupled together by screws 115 a and 115 b.

The screws 115 a and 115 b may enable the upper bar 75, the module cover 15, and the display panel 10 to rise or fall together. The screw 115 a may couple the upper bar 75 and the module cover 15 together. Alternatively, the screw 115 b may couple the upper bar 75 and the display panel 10 together, but the present disclosure is not limited thereto. For example, the one or more screws 115 a and 115 b may couple the module cover 15, the upper bar 75, and the display panel 10 together.

The upper part of the module cover 15 may have a shape to be coupled to the upper bar 75. An upper segment 15 t may be located at the top of the module cover 15. The upper segment 15 t may have a shape different from those of the remaining segments 15 a. The upper segment 15 t may also be referred to as an upper module cover 15 t.

The upper segment 15 t may include a first body 15 ta connected to another segment 15 a and a second body 15 tb connected to the upper bar 75. The bottom of the first body 15 ta may be connected to another segment 15 a, and the second body 15 tb may be formed at the upper part of the first body 15 ta.

The upper bar 75 may include a groove 75 a formed in the +y-axis direction. The second body 15 tb may be inserted into the groove 75 a. The screw 115 a may penetrate the second body 15 tb in the z-axis direction.

The thickness of the first body 15 ta in the z-axis direction may be formed to be thicker than that of the second body 15 tb in the z-axis direction.

Referring to FIG. 10, a top casing 167 may shield the upper bar 75, the module cover 15, and the display panel 10. The upper bar 75, the module cover 15, and the display panel 10 may not be exposed outside the top casing 167. Accordingly, an external appearance of the display device may become neat and trim.

The top casing 167 may be coupled to the upper bar 75, the module cover 15 or the display panel 10 by a screw.

Referring to FIGS. 11 and 12, both ends of the module cover 15 may be bent in the +z-axis direction. The display panel 10 may be attached to a portion that belongs to the module cover 15 and that has not been bent. The length of both ends of the module cover 15 that have been bent in the +z-axis direction may be greater than the sum of the thicknesses of the display panel 10 and the adhesive layer 70. That is, the bent length of the module cover 15 may be more protruded than the display panel 10 in the +z-axis direction at a specific distance AD1. Accordingly, when the module cover 15 is viewed in the x-axis direction, the display panel 10 may be covered.

Referring to FIG. 11, the adhesive layer 70 may be disposed between the display panel 10 and the module cover 15. The adhesive layer 70 may be lengthily disposed in the x-axis direction. The entire display panel 10 may be attached to the module cover 15. In this case, the module cover 15 and the display panel 10 may not be separated because an adhesive force between them is very strong.

Referring to FIG. 12, the adhesive layer 70 may be disposed between the display panel 10 and the module cover 15. The adhesive layer 70 may be disposed in a portion between the display panel 10 and the module cover 15. For example, the adhesive layers 70 may be disposed at one end and the other end of the display panel 10, respectively. Accordingly, the adhesive layer 70 may be less used compared to a case where the adhesive layer 70 is disposed lengthwise in the x-axis direction. Accordingly, a production cost for the display device can be reduced.

The display panel 10 and the module cover 15 have been illustrated as being attached through the adhesive layer 70, but the present disclosure is not limited thereto. For example, the display panel 10 and the module cover 15 may be attached through a magnet.

Referring to FIG. 13, a bead 136 may be formed on a top surface of a segment 15 b. The bead 136 may have a shape depressed into the segment 15 b. The bead 136 may have a shape depressed in the −y-axis direction. A plurality of the beads 136 may be formed on the segment 15 b. The plurality of beads 136 may be spaced apart from each other. The bead 136 can enhance a stiffness of the segment 15 b. For example, the bead 136 can prevent the shape of the segment 15 b from being deformed by an external impact.

Referring to FIG. 14, the source PCB 120 may be located over the module cover 15. The location of the source PCB 120 may be changed along with a movement of the module cover 15 when the display device changes from the first state to the second state.

An FFC cable 231 may be located at the central part of the module cover 15 based on the first direction, but the present disclosure is not limited thereto. For example, the FFC cables 231 may be located on both ends of the module cover 15 based on the first direction.

Referring to FIG. 15, a segment 15 d may include a depressed portion 425 depressed in the −z-axis direction. The depressed portion 425 may form a space between the display panel 10 and the module cover 15. The FFC cable 231 may be accommodated in the space formed by the depressed portion 425. Furthermore, the depressed portion 425 can enhance the stiffness of the segment 15 d.

The bead 136 may be located on the segment 15 d other than the portion where the depressed portion 425 is located. The bead 136 may not be located in the portion where the depressed portion 425 is located because the thickness of the segment 15 d in the third direction is thin in the portion where the depressed portion 425 is located. However, the present disclosure is not limited thereto. For example, the bead 136 may be located in any portion where the depressed portion 425 is located.

Referring to FIG. 16, a penetration portion 437 may be located at a central part of a segment 15 e based on the first direction. The penetration portion 437 may pass through the central part of the segment 15 e in the second direction. That is, the penetration portion 437 may be a hole located within the segment 15 e. The penetration portion 437 may be a portion where the FFC cable 231 is located. The thickness of the segment 15 e can be reduced compared to a case where the FFC cable 231 is located in the depressed portion 425 because the penetration portion 437 is formed within the segment 15 e.

The bead 136 may be located on the segment 15 e other than the portion where the penetration portion 437 is located. The bead 136 may not be located in the portion where the penetration portion 437 is located because the thickness of the segment 15 e in the third direction is thin in the portion where the penetration portion 437 is located, but the present disclosure is not limited thereto. For example, the bead 136 may be located in the portion where the penetration portion 437 is located.

Referring to FIG. 17, in the display device according to an embodiment of the present disclosure, the top casing 167 can shield the source PCB 120 and the upper bar 75 in addition to the display panel 10 and the module cover 15. Accordingly, an external appearance of the display device may become neat and tidy because the source PCB 120 is not exposed to the outside.

The upper bar 75 may have one side coupled to the back surface of the module cover 15 and the other side coupled to the source PCB 120. The upper bar 75 may be fixed to the module cover 15 and may support the source PCB 120.

The bottom end of the FFC cable 231 may be connected to the timing controller board 105 within the panel roller 143. The FFC cable 231, together with the display portion 20, may be wound on or unwound from the panel roller 143.

Part of the FFC cable 231 may be located between the display panel 10 and the module cover 15. A portion that belongs to the FFC cable 231 and that is located between the display panel 10 and the module cover 15 may be referred to as a first portion 231 a. The first portion 231 a may be located in the depressed portion 425 formed by the plurality of segments 15 d. Alternatively, the first portion 231 a may be accommodated in the depressed portion 425 formed by the plurality of segments 15 d.

Part of the FFC cable 231 may pass through a segment 15 f. A portion that belongs to the FFC cable 231 and that passes through the segment 15 f may be referred to as a second portion 231 b. The segment 15 f may include a first hole 521 a formed in the front surface and a second hole 521 b formed in the back surface. The first hole 521 a and the second hole 521 b may be connected to form a single hole 521. The hole 521 may pass through the segment 15 f in the third direction. The second portion 231 b may pass through the hole 521. The hole 521 may also be referred to as a connecting hole 521.

The top end of the FFC cable 231 may be electrically connected to the source PCB 120. Part of the FFC cable 231 may be located in the back surface of the module cover 15. A portion that belongs to the FFC cable 231 and that is located in the back surface of the module cover 15 may be referred to as a third portion 231 c. The third portion 231 c may be electrically connected to the source PCB 120.

The third portion 231 c may be shielded by the top casing 167. Accordingly, the third portion 231 c may not be exposed to the outside.

Referring to FIG. 18, in the display device according to an embodiment of the present disclosure, the FFC cable 231 may be connected to the timing controller board 105 mounted on the panel roller 143. A through hole 615 may be located on the panel roller 143. The FFC cable 231 may be connected to the timing controller board 105 through the through hole 615.

The through hole 615 is located on one side of the panel roller 143, and may pass through the outer portion of the panel roller 143. The FFC cable 231 may be connected to one side of the timing controller board 105 through the through hole 615.

In the display device according to an embodiment of the present disclosure, although the FFC cable 231 is located on the outer circumference of the panel roller 143, it can maintain connection with the timing controller board 105 through the through hole 615. Accordingly, the FFC cable 231 may not be twisted because it rotates along with the panel roller 143.

Part of the FFC cable 231 may be wound on the panel roller 143. A portion that belongs to the FFC cable 231 and that is wound on the panel roller 143 may be referred to as a fourth portion 231 d. The fourth portion 231 d may come into contact with the outer surface of the panel roller 143.

Part of the FFC cable 231 may pass through the through hole 615. A portion that belongs to the FFC cable 231 and that passes through the through hole 615 may be referred to as a fifth portion 231 e.

The bottom end of the FFC cable 231 may be electrically connected to the timing controller board 105. Part of the FFC cable 231 may be located within the panel roller 143. A portion that belongs to the FFC cable 231 and that is located within the panel roller 143 may be referred to as a sixth portion 231 f The sixth portion 231 f may be electrically connected to the timing controller board 105.

Referring to FIG. 19, a back surface of a display panel 10 may be attached to a plate 11. A front surface of the display panel 10 may display a screen. The plate 11 may include a metal material.

Referring to FIGS. 20A, 20B, 25 and 26, a plate 11 a may include a plurality of holes 12. The plate 11 a may include an area where the holes 12 are formed and areas 11 f, 11 g, and 11 h where the holes 12 are not formed. The areas 11 f, 11 g, and 11 h where the holes 12 are not formed may surround the areas where the holes 12 are formed. The areas 11 f, 11 g, and 11 h where the holes 12 are not formed can protect edges of the display panel 10. The holes 12 may be referred to as openings 12.

A first area 11 g where the holes 12 are not formed, the area where the holes 12 are formed, and a second area 11 h where the holes 12 are not formed may be sequentially located along the left-right direction LR of the plate 11 a. A width of the first area 11 g in the left-right direction LR may be a2. A width of the area where the holes 12 are formed in the left-right direction LR may be a1. A width of the second area 11 h in the left-right direction LR may be a3.

A third area 11 f where the holes 12 are not formed and the area where the holes 12 are formed may be sequentially located along the up-down direction UD of the plate 11 a. A height of the third area 11 f in the up-down direction UD may be b2. A height of the area where the holes are formed in the up-down direction UD may be b1.

The third area 1 if where the holes 12 are not formed may be coupled with a device. For example, the device may be an upper bar. The upper bar may be coupled with a link.

The holes 12 may penetrate the plate 11 a. The holes 12 may be formed by punching the plate 11 a. The holes 12 may be slits 12 a and 12 b. The slits 12 a and 12 b may be elongated along the left right-direction LR of the plate 11 a. The holes 12 may include a relatively long slit 12 a and a relatively short slit 12 b.

The relatively long slit 12 a may have a length d8 and a width d9. The relatively short slit 12 b may have a length d10 and a width d9.

The slits 12 a and 12 b may be spaced along the left-right direction LR of the plate 11 a. The neighboring slits 12 a and 12 b may be located with a constant distance d2.

The slits 12 a and 12 b may be spaced along the up-down direction UD of the plate 11 a. The neighboring slits 12 a and 12 b may be located with a constant distance d1.

The smaller the distances d1, d2 between the slits 12 a, 12 b are, the more easily the plate 11 a can be wound or unwound. The greater the distances d1, d2 between the slits 12 a, 12 b are, the greater elasticity the plate 11 a has.

The display panel 10 may have a very thin thickness. The display panel 10 can be easily wrinkled due to its thin thickness. The display panel 10 can be easily broken from an external impact due to its thin thickness.

The plate 11 may be fixed to the display panel 10 to increase rigidity of the display panel 10. The plate 11 supports the display panel 10 to prevent the display panel 10 from being wrinkled.

The plate 11 may be made of a metal material having high rigidity. The plate 11 is preferably made of a material having high elasticity. The plate 11 is provided with the slits 12 a and 12 b so that it can be wound or unwound by the roller 143. Since the plate 11 is provided with the slits 12 a and 12 b, permanent deformation may not occur even if it is wound or unwound by the roller 143.

An adhesive layer 13 may be formed on the back surface of the display panel 10. The adhesive layer 13 can fix the display panel 10 to the plate 11. The display panel 10, the adhesive layer 13, and the plate 11 may be integrally coupled to form a display portion, and may be wound or unwound by the roller 143.

The slits 12 a and 12 b may be arranged in rows and columns. Odd rows r1, r3, r5, r7, r9, r11, r13, r15, r17, r19, r21, r23, and r25 may be composed of the relatively long slits 12 a. The slits 12 a in the odd rows r1, r3, r5, r7, r9, r11, r13, r15, r17, r19, r21, r23, and r25 may be arranged in columns t1, t2, t3, t4, t5, t6, t7, and t8.

Even rows r2, r4, r6, r8, r10, r12, r14, r16, r18, r20, r22, and r24 may be composed of the relatively short slit 12 b and the relatively long slit 12 a. The slits 12 a and 12 b in the even rows may be arranged in columns. The slits 12 a and 12 b in the even rows r2, r4, r6, r8, r10, r12, r14, r16, r18, r20, r22 and r24 may be arranged in columns s1, s2, s3, s4, s5, s6, s7, s8, and s9.

The relatively short slit 12 b and the relatively long slit 12 a may be arranged alternately along the up-down direction UD. The relatively short slits 12 b may be arranged on both sides of the left-right direction LR in the even rows r2, r4, r6, r8, r10, r12, r14, r16, r18, r20, r22, and r24.

A straight line 11 connecting a center c221 of a first slit 12 b 221 of a 22nd row r22 and a center c222 of a second slit 12 a 222 of the 22nd row r22 may pass through centers of remaining slits of the 22nd row r22.

A straight line 12 connecting a center c231 of a first slit 12 b 231 of a 23rd row r23 and a center c232 of a second slit 12 a 232 of the 23rd row r23 may pass through centers of remaining slits of the 23rd row r23.

A straight line 13 connecting a center c241 of a first slit 12 b 241 of a 24th row r24 and a center c242 of a second slit 12 a 242 of the 24th row r24 may pass through centers of remaining slits of the 24th row r24.

A straight line 14 connecting a center c251 of a first slit 12 a 251 of a 25th row r25 and a center c252 of a second slit 12 a 252 of the 25th row r25 may pass through centers of remaining slits of the 25th row r25.

A straight line 15 connecting a center c221 of a 11th slit 12 b 221 of a first column s1 and a center line c241 of a 12th slit 12 b 241 of the first column s1 in the even rows r2, r4, r6, r8, r10, r12, r14, r16, r18, r20, r22, and r24 may pass through centers of remaining slits of the first column s1.

A straight line 16 connecting a center c231 of a 12th slit 12 a 231 of a first column t1 and a center c251 of a 13th slit 12 a 251 of the first column t1 in the odd rows r1, r3, r5, r7, r9, r11, r13, r15, r17, r19, r21, r23, and r25 may pass centers of remaining slits of the first column t1.

A straight line 17 connecting a center c222 of an 11th slit 12 a 222 of a second column s2 and a center line c242 of a 12th slit 12 a 242 of the second column s2 in the even rows r2, r4, r6, r8, r10, r12, r14, r16, r18, r20, r22, and r24 may pass through centers of remaining slits of the second column s2.

A straight line 18 connecting a center c232 of a 12th slit 12 a 232 of a second column t2 and a center c252 of a 13th slit 12 a 252 of the second column t2 in the odd rows r1, r3, r5, r7, r9, r11, r13, r15, r17, r19, r21, r23, and r25 may pass centers of remaining slits of the second column t2.

A center distance d11 of neighboring slits 12 a 232 and 12 a 233 in the same row may be larger than a length d8 of a slit 12 a 243 of the neighboring row.

A center distance d13 between slits 12 a 237, 12 a 247 and 12 a 248 of neighboring rows r23 and r24 and a center distance d11 between slits 12 a 247 and 12 a 248 in the same row r24 may be an isosceles triangle. The center distance d11 between the slits 12 a 247 and 12 a 248 in the same row r24 may be a base of the isosceles triangle. A distance d12 between the neighboring rows r23 and r24 may be a height of the isosceles triangle.

Referring to FIGS. 21, 25 and 26, a plate 11 b may include a plurality of holes 12. The plate 11 b may include an area where the holes 12 are formed and an area 11 j where the holes 12 are not formed. The area 11 j where the holes 12 are not formed may be located on an upper side of the area where the holes 12 are formed. The area 11 j where the holes 12 are not formed can protect edges of the display panel 10.

The area 11 j where the holes 12 are not formed may be coupled with a device. For example, the device may be an upper bar. The upper bar may be coupled with a link.

A height of the third area 11 j where the holes 12 are not formed may be b4 in the up-down direction UD. A height of the area where the holes 12 are formed may be b3 in the up-down direction UD.

The holes 12 may penetrate the plate 11 b. The holes 12 may be formed by punching the plate 11 b. The holes 12 may be slits 12 a, 12 c, and 12 d. The slits 12 a, 12 c, and 12 d may be elongated along the left right-direction LR of the plate 11 b. The holes 12 may include a relatively long slit 12 a and 12 c and a relatively short slit 12 d. The holes 12 may include the slits 12 c and 12 d which are opened at one side.

The slits 12 a and 12 c may be spaced along the left-right direction LR of the plate 11 b. Neighboring slits 12 a 168, 12 a 169, 12 a 187, and 12 a 188 may be located with a constant distance d2.

The slits 12 c and 12 d may be spaced along the up-down direction UD of the plate 11 b. The neighboring slits 12 c and 12 d may be located with a constant distance d1.

The slits 12 a, 12 c, and 12 d may be arranged in rows and columns. Odd rows e1, e3, e5, e7, e9, e11, e13, e15, e17, e19, e21, e23 and e25 may be composed of the relatively long slits 12 a and 12 c. The slits 12 a and 12 c in the odd rows e1, e3, e5, e7, e9, e11, e13, e15, e17, e19, e21, e23, and e25 may be arranged in columns g1, g2, g3, g4, g5, g6, g7, and g8.

Even rows e2, e4, e6, e8, e10, e12, e14, e16, e18, e20, e22, and e24 may be composed of the relatively short slit 12 d and the relatively long slit 12 a. The slits 12 a and 12 d in the even rows may be arranged in columns. The slits 12 a and 12 d in the even rows e2, e4, e6, e8, e10, e12, e14, e16, e18, e20, e22, and e24 may be arranged in columns f1, f2, f3, f4, f5, f6, f7, f8, and f9.

The relatively short slit 12 d and the relatively long slit 12 c may be alternately arranged along the up-down direction UD. The relatively short slits 12 d may be arranged on both sides of the left-right directions LR in the even rows e2, e4, e6, e8, e10, e12, e14, e16, e18, e20, e22, and e24.

The relatively long slits 12 c, 12 c 158, and 12 c 178 among the slits 12 c and 12 d having one side opened may have a length d14 and a width d9. The relatively short slits 12 d, 12 d 169, and 12 d 189 among the slits 12 c and 12 d having one side opened may have a length d15 and a width d9.

The length d14 of the slits 12 c, 12 c 158, and 12 c 178 having one side opened and the length d8 of the slits 12 a, 12 a 157, and 12 a 168 without opening may be the same.

Referring to FIG. 22, a plate 11 c may include a plurality of holes 12 f. The plate 11 c may include an area where the holes 12 f are formed and areas 11 k, 11 l, and 11 m where the holes 12 f are not formed. The areas 11 k, 11 l, and 11 m where the holes 12 f are not formed may surround the areas where the holes 12 f are formed. The areas 11 k, 11 l, and 11 m where the holes 12 f are not formed can protect edges of the display panel 10. The area 11 k where the holes 12 f are not formed may be coupled with a device. For example, the device may be an upper bar. The upper bar may be coupled with a link.

The holes 12 f may penetrate the plate 11 c. The holes 12 f may be formed by punching the plate 11 c. The holes 12 f may have a shape of a rhombus.

The holes 12 f may have a length d17 in the left-right direction LR and a length d16 in the up-down direction UD. Neighboring holes 12 f may have a distance d18 in the left-right direction LR. The neighboring holes 12 f may have a distance d19 in the up-down direction UD.

Referring to FIGS. 23, 25 and 26, a plate 11 d may include a plurality of holes 12 g. The plate 11 d may include an area where the holes 12 g are formed and areas 11 o, 11 p, and 11 q where the holes 12 g are not formed. The areas 11 o, 11 p, and 11 q where the holes 12 g are not formed may surround the areas where the holes 12 g are formed. The areas 11 o, 11 p, and 11 q where the holes 12 g are not formed can protect edges of the display panel 10.

The area 11 o where the holes 12 g are not formed may be coupled with a device. For example, the device may be an upper bar. The upper bar may be coupled with a link.

The holes 12 g may penetrate the plate 11 d. The holes 12 g may be formed by punching the plate 11 d. The holes 12 g may have a shape of a circle.

The holes 12 g may be spaced along the left-right direction LR of the plate 11 d. The holes 12 g may be spaced along the up-down direction UD of the plate 11 d.

The holes 12 g may be arranged in rows p1, p2, p3, p4, p5, p6, p7, p8, p9, p10, p11, p12, p13, p14, p15, and p16 and columns q1, h1, q2, h2, q3, h3, q4, h4, q5, h5, q6, h6, q7, h7, q8, h8, and q9.

The holes 12 g and 12 g 121 may have a diameter d20.

Neighboring holes 12 g 122, 12 g 142, 12 g 132, and 12 g 152 in the same columns h2 and q3 may have a distance d22 in the up-down direction UD. Neighboring holes 12 g 131, 12 g 132, 12 g 141, and 12 g 142 in the same rows p13 and p14 may have a distance d21 in the left-right direction LR.

A center distance d23 between the holes 12 g 142, 12 g 151 and 12 g 152 in neighboring rows q2, h2 and q3 and a center distance d24 between the holes 12 g 151 and 12 g 152 in the same row p15 may be an isosceles triangle.

Referring to FIGS. 24, 25, and 26, a plate 11 e may include a plurality of holes 12 h. The plate 11 e may include an area where the holes 12 h are formed and areas 11 r, 11 s, and 11 t where the holes 12 h are not formed. The areas 11 r, 11 s, and 11 t where the holes 12 h are not formed may surround the area where the holes 12 h are formed. The areas 11 r, 11 s, and 11 t where the holes 12 h are not formed can protect edges of the display panel 10.

The area 11 r where the holes 12 h are not formed may be coupled with a device. For example, the device may be an upper bar. The upper bar may be coupled with a link.

The holes 12 h may penetrate the plate 11 e. The holes 12 h may be formed by punching the plate 11 e. The holes 12 h may have a shape of an ellipse. The hole 12 h may be in the form of a long hole. The holes 12 h may be elongated along the left-right direction LR of the plate 11 e.

The holes 12 h may be spaced along the left-right direction LR of the plate 11 e. Neighboring holes 12 h may be located with a constant distance d7.

The holes 12 h may be spaced along the up-down direction UD of the plate 11 e. Neighboring holes 12 g may be located with a constant distance d6.

The holes 12 g may be arranged in rows u1, u2, u3, u4, u5, u6, u7, u8, u9, u10, u11, u12, u13, u14, u15, u16, u17, u18, u19, u20, u21, u22, u23, u24, u25, u26, and u27 and columns v1, w1, v2, w2, v3, w3, v4, w4, v5, w5, v6, w6, v7, w7, v8, w8, and v9.

Neighboring holes 12 h 231, 12 h 251, 12 h 222, and 12 h 242 in the same rows v1 and w2 may have a distance d27 in the up-down direction UD. Neighboring holes 12 h 221, 12 h 222, 12 h 251, and 12 h 252 in the same rows u22 and u25 may have a distance d28 in the left-right direction LR.

A center distance d29 between the holes 12 h 232, 12 h 241, and 12 h 242 in neighboring rows w1, v2 and w2 and a center distance d30 between the holes 12 h 241 and 12 h 242 in the same row u24 may be an isosceles triangle.

Referring to FIG. 27, a plate 11 may be coupled to a back surface of a display panel 10. A first resin layer 14 may be coupled to a back surface of the plate 11.

The first resin layer 14 may cover the plate 11. The plate 11 may not be exposed to outside due to the first resin layer 14.

Referring to FIGS. 28 and 29, the first resin layer 14 and the plate 11 may be coupled through a laminating process. The plate 11 may be placed on the first resin layer 14.

The plate 11 and the first resin layer 14 may be heated through a heating device. A portion of the first resin layer 14 may be melted. The melted first resin layer 14 may be adhered to the plate 11. The melted first resin layer 14 can fill the holes 12 of the plate 11. The plate 11 may be accommodated in the first resin layer 14.

When the heated plate 11 and the first resin layer 14 are cooled, the plate 11 and the first resin layer 14 may be integrally formed. A front surface of the combination of the plate 11 and the first resin layer 14 may be flat.

Referring to FIGS. 30 and 31, an adhesive layer 13 may be formed on a back surface of the display panel 10. The adhesive layer 13 can fix the display panel 10 to the plate 11. The adhesive layer 13 can fix the display panel 10 to the first resin layer 14 because the front surface of the combination of the plate 11 and the first resin layer 14 is flat.

The first resin layer 14 may be a material having high softness. For example, the first resin layer 14 may include a material of urethane or rubber.

The display panel 10, the adhesive layer 13, the plate 11, and the first resin layer 14 may be integrally coupled to form a display portion and may be wound or unwound on the roller 143.

Referring to FIG. 32, a second resin layer 16 may be coupled to a back surface of a display panel 10. A plate 11 may be coupled to a back surface of the second resin layer 16. A first resin layer 14 may be coupled to a back surface of the plate 11.

The first resin layer 14 may cover the plate 11. The plate 11 may not be exposed to outside due to the first resin layer 14.

Referring to FIGS. 33 and 34, the plate 11 may be disposed between the first resin layer 14 and the second resin layer 16. The first resin layer 14, the second resin layer 16, and the plate 11 may be coupled through a laminating process. The first resin layer 14 and the second resin layer 16 may be coupled with each other to form a first resin layer. A material of the first resin layer 14 and a material of the second resin layer 16 may be the same. The first resin layer 14 may partially melt and fill the holes 12 of the plate 11. The second resin layer 16 may partially melt and fill the holes 12 of the plate 11. The first resin layer may partially melt and fill the holes 12 of the plate 11. The plate 11 may be disposed inside the first resin layer.

The plate 11, the first resin layer 14, and the second resin layer 16 may be integrally formed. The plate 11 and the first resin layer may be formed integrally. A front surface of the second resin layer 16 may be flat. A front surface of the first resin layer may be flat.

An adhesive layer 13 may be formed on a back surface of the display panel 10. The adhesive layer 13 can fix the display panel 10 to the second resin layer 16. The adhesive layer 13 can fix the display panel 10 to the first resin layer.

The second resin layer 16 may be a material having high softness. For example, the second resin layer 16 may include a material of urethane or rubber.

The first resin layer may be a material having high softness. For example, the first resin layer may include a material of urethane or rubber.

The display panel 10, the adhesive layer 13, the second resin layer 16, the plate 11, and the first resin layer 14 may be integrally coupled to form a display portion and may be wound or unwound on the roller 143. The display panel 10, the adhesive layer 13, the first resin layer, and the plate 11 may be integrally coupled to form a display portion and may be wound or unwound by the roller 143.

The larger a distance d31 of the holes 12 is, the larger a coupled area of the first resin layer 14 and the second resin layer 16 can be. The larger the coupled area of the first resin layer 14 and the second resin layer 16 becomes, the more strongly the first resin layer 14 and the second resin layer 16 can be coupled.

Referring to FIG. 35, the display device according to an embodiment of the present disclosure may have a shape in which both sides of the upper bar 75 are supported by the links 73. The upper bar 75 may rise or fall by the links 73. Each of the links 73 may include a first arm 73 a and a second arm 73 b.

The first arm 73 a may also be referred to as an upper link 73 a. The second arm 73 b may also be referred to as a lower link 73 b.

The first arm 73 a and the second arm 73 b may be connected by an arm joint 152. The arm joint 152 may also be referred to as the hinge 152 or the joint 152.

The top of the first arm 73 a may be coupled to the upper bar 75. The other end of the first arm 73 a may be coupled to the arm joint 152. The top of the second arm 73 b may be coupled to the motor assembly. The bottom of the second arm 73 b may be coupled to the arm joint 152.

A guide bar 234 may be located at the entrance 30 a through which the link 73 rises or fall into the housing 30. The guide bar 234 may include first and second guide bars 234 a and 234 b. The entrance 30 a of the housing 30 may be formed between the first and the second guide bars 234 a and 234 b. The first and the second guide bars 234 a and 234 b may face each with the link 73 interposed therebetween. For example, the first guide bar 234 a may be located at the back of the link 73, and the second guide bar 234 b may be located at the front of the link 73.

The panel roller 143 may be located at the front of the link 73. The base 31 of the housing 30 may include a plurality of brackets 221. The base 31 may also be referred to as a bottom surface 31.

The plurality of brackets 221 may be formed under the panel roller 143. The plurality of brackets 221 may be spaced apart from each other in the length direction of the panel roller 143. Alternatively, the plurality of brackets 221 may be spaced apart from each other in the length direction of the base 31. Each of the brackets 221 may be fixed to the base 31 through a screw.

Referring to FIG. 36, the display device according to an embodiment of the present disclosure may have a gear shape in which the other side of the first arm 73 a and one side of the second arm 73 b located within the arm joint 152 correspond to each other and are geared. The arm joint 152 may also be referred to as a connecting portion 152. The first arm 73 a may also be referred to as the upper support link 73 a. The second arm 73 b may also be referred to as the lower support link 73 b.

The first arm 73 a may be pivotally connected to the upper part of the arm joint 152. The second arm 73 b may be pivotally connected to the lower part of the arm joint 152.

A gear st1 may be formed at the lower part of the first arm 73 a. A gear st2 may be formed at the lower part of the second arm 73 b. The gear st1 of the first arm 73 a and the gear st2 of the second arm 73 b may gear together.

The angle HRA1 of the first arm 73 a from the ground and the angle HRA2 of the second arm 73 b from the ground may be the same because the first arm 73 a and the second arm 73 b have the gear shape in which they are engaged. Furthermore, the angles between the first arms 73 a and the second arms 73 b on both sides may be the same because the first arm 73 a and the second arm 73 b have the gear shape in which they are engaged. Accordingly, both sides of the upper bar 75 may rise or fall while maintaining horizontality without leaning to one side. That is, the angles between the first arms 73 a and second arms 73 b of the links 73 on both sides may be the same regardless of the height of the upper bar 75 from the ground.

Referring to FIGS. 37 to 39, as the display device according to an embodiment of the present disclosure changes from the first state to the second state, the upper bar 75 may rise. The upper bar 75 may rise up or fall down by the link 73 connected to both ends of the upper bar.

As shown in FIG. 37, in the first state, the angle HRA between the first arm 73 a and the second arm 73 b may be very small. Accordingly, the upper bar 75 may not rise. Furthermore, the display panel and the module cover may have been wound on the panel roller.

As shown in FIG. 38, when the motor assembly 137 rotates, the angle HRA between the first arm 73 a and the second arm 73 b may increase. As the angle HRA between the first arm 73 a and the second arm 73 b increases, the upper bar 75 may rise. Accordingly, the display panel and the module cover wound on the panel roller may be gradually unwound.

As shown in FIG. 39, in the second state, the first arm 73 a and the second arm 73 b may be located on a straight line. That is, the angle HRA between the first arm 73 a and the second arm 73 b may become 180 degrees. Accordingly, the upper bar 75 may rise to a maximum height. Furthermore, the display panel and the module cover may be unwound from the panel roller.

Referring to FIG. 40, the display device according to an embodiment of the present disclosure may include a plurality of the first arms 73 a and the second arms 73 b.

More specifically, the first arm 73 a may include a first upper arm 73Ca and a second upper arm 73Fa. Furthermore, the second arm 73 b may include a first lower arm 73Cb and a second lower arm 73Fb.

The first upper arm 73Ca may also be referred to as a first upper link 73Ca. The second upper arm 73Fa may also be referred to as a second upper link 73Fa. The first lower arm 73Cb may also be referred to as a first lower link 73Cb. The second lower arm 73Fb may also be referred to as a second lower link 73Fb.

The first arm 73 a may be pivotally connected to the upper part of the arm joint 152. The second arm 73 b may be pivotally connected to the lower part of the arm joint 152.

More specifically, the second upper arm 73Fa may be connected over the first upper arm 73Ca. The second lower arm 73Fb may be connected under the first lower arm 73Cb.

A gear st3 may be formed at the lower part of the first upper arm 73Ca. A gear st4 may be formed at the upper part of the first lower arm 73Cb. The gear st3 of the first upper arm 73Ca and the gear st4 of the first lower arm 73Cb may gear together.

The angle HRA1 of the first upper arm 73Ca from the ground and the angle HRA2 of the first lower arm 73Cb from the ground may be the same because the first upper arm 73Ca and the first lower arm 73Cb gear together. Furthermore, the angles between the first upper arms 73Ca and the first lower arms 73Cb on both sides may be the same because the first upper arm 73Ca and the first lower arm 73Cb on each of both sides gear together. Accordingly, the upper bar 75 can rise or fall while maintaining horizontality without learning to one side. That is, the angles between the first upper arms 73Ca and the first lower arms 73Cb on both sides may be the same regardless of the height of the upper bar 75 from the ground.

A gear may not be formed in the second upper and lower arms 73Fa and 73Fb. The angle between the second upper arm 73Fa and the second lower arm 73Fb is the same as that between the first upper arm 73Ca and the first lower arm 73Cb.

As shown in FIG. 41, in a display device according to one embodiment, upper and lower arms 73 a and 73 b may be formed of a single arm. Accordingly, when an external force F is applied to one side, the angle HLA between the upper and lower arms 73 a and 73 b may be changed. In this case, the display panel may incline toward one side.

In contrast, as shown in FIG. 42, when the gear st3 of the first upper arm 73Ca and the gear st4 of the first lower arm 73Cb gear together, although an external force F is applied to one side of the display device, the angle HLA between the upper and lower arms 73 a and 73 b may not be changed. Accordingly, damage attributable to the inclination of the display panel can be prevented.

Referring to FIG. 43, one side of the first upper and lower arms 73Ca and 73Cb may extend in a direction toward the second upper and lower arms 73Fa and 73Fb. That is, the width of the first upper and lower arms 73Ca and 73Cb may increase. Accordingly, when the link 73 is viewed from the front of the display device, the first upper and lower arms 73Ca and 73Cb may shield the second upper and lower arms 73Fa and 73Fb at the front surface. Alternatively, the first upper arm 73Ca and the second upper arm 73Fa may be superimposed. Alternatively, the first lower arm 73Cb and the second lower arm 73Fb may be superimposed.

The pivot of the first upper arm 73Ca, the pivot of the second upper arm 73Fa, the pivot of the first lower arm 73Cb, and the pivot of the second lower arm 73Fb may be spaced apart from each other.

The height of the arm joint 152 in the vertical direction at a portion connected to the first upper and lower arms 73Ca and 73Cb may be different from the height of the arm joint 152 in the vertical direction at a portion connected to the second upper and lower arms 73Fa and 73Fb.

Although not shown, one side of the second upper and lower arms 73Fa and 73Fb may extend in a direction toward the first upper and lower arms 73Ca and 73Cb. That is, when viewed from the back surface, the width of the second upper and lower arms 73Fa and 73Fb may increase. Accordingly, the second upper and lower arms 73Fa and 73Fb may shield the first upper and lower arms 73Ca and 73Cb at the front surface.

As shown in FIG. 44, in the first state, the width of at least part of the first upper and lower arms 73Ca and 73Cb may overlap or superimpose the second upper and lower arms 73Fa and 73Fb. For example, the first upper and lower arms 73Ca and 73Cb may be isolated from the second upper and lower arms 73Fa and 73Fb at a specific distance SLB, and may overlap the second upper and lower arms 73Fa and 73Fb. Accordingly, the total width HLW of the first arm 73 a may be greater than the width of the second upper arm 73Fa or the width CLW of the first upper arm 73Ca.

In some embodiments, as shown in FIG. 45, in the second state, a total width of the first upper and lower arms 73Ca and 73Cb may superimpose the second upper and lower arms 73Fa and 73Fb. Accordingly, the total width HLW of the first arm 73 a may be the same as the width of the second upper arm 73Fa or the width CLW of the first upper arm 73Ca.

As shown in FIG. 46, if one side of the first upper arm 73Ca has not extended, when the first upper arm 73Ca changes from the second state to the first state, the first upper arm 73Ca and the second upper arm 73Fa may be spaced apart from each other at a specific interval LD. As the first upper arm 73Ca changes from the second state to the first state, the interval LD between the first upper arm 73Ca and the second upper arm 73Fa may increase.

In this case, when the first upper arm 73Ca changes from the first state to the second state, there is a problem in that a user's hand may be injured because the hand is caught between the first upper arm 73Ca and the second upper arm 73Fa.

In some embodiments, as shown in FIG. 47, when one side of the first upper arm 73Ca extends and overlaps the second upper arm 73Fa, although the first upper arm 73Ca changes from the second state to the first state, the interval between the first upper arm 73Ca and the second upper arm 73Fa may not be exposed. Accordingly, a danger that a user's hand is caught between the first upper arm 73Ca and the second upper arm 73Fa while the first upper arm 73Ca changes from the first state to the second state can be prevented.

Referring to FIG. 48, the plurality of magnets 64 may be located on the link 73. For example, at least one magnet 64 may be located on the first arm 73 a, and at least one magnet 64 may be located on the second arm 73 b. The plurality of magnets 64 may be spaced apart from each other.

The display portion may include a metal material. The display portion may be closely attached to the link 73 by the magnets 64. Although the magnetic force of any one of the plurality of magnets 64 is weakened, the close adhesion of the display panel and module cover to the link 73 can be maintained by the remaining magnets 64.

Referring to FIG. 49, one magnet 64 may be located on each of the first arm 73 a and the second arm 73 b. In this case, the magnet 64 may have a shape that lengthily extends in the long-side direction of the first arm 73 a and the second arm 73 b.

Since the magnet 64 has the shape that lengthily extends in the long-side direction of the first arm 73 a and the second arm 73 b, the area of a portion where the link 73 closely adheres to the display panel and the module cover can be increased. Accordingly, an adhesion force between the link 73 and the display panel and the module cover can be further increased.

Referring to FIG. 50, the magnet 64 may be located in a depressed portion 321 formed in the link 73. The depressed portion 321 may have a shape depressed toward the inside of the link 73. The magnet 64 may be combined with the link 73 by at least one screw 187.

The width LHW of the depressed portion 321 depressed toward the link 73 may be the same as or greater than the thickness MGW of the magnet 64. If the thickness MGW of the magnet 64 is greater than the width LHW of the depressed portion 321, the display panel 10 and the module cover 15 may not close adhere to the link 73. In this case, the display panel 10 may be wrinkled or may not be flat.

A panel protection portion 97 may be disposed on the back surface of the display panel 10. The panel protection portion 97 may prevent an impact on the display panel 10, which is attributable to friction with the module cover 15. The panel protection portion 97 may include a metal material. The panel protection portion 97 may have a very thin thickness. For example, the panel protection portion 97 may have a thickness of about 0.1 mm.

Mutual attraction may act between the panel protection portion 97 and the magnet 64 because the panel protection portion 97 includes a metal material. The module cover 15 located between the panel protection portion 97 and the link 73 may closely adhere to the magnet 64 although it does not include a metal material.

Referring to FIG. 51, if a magnet is not provided on the link 73, the module cover 15 may be closely attached to the link 73 by the upper bar 75 on the upper side and the guide bar on the lower side. A portion that belongs to the link 73 and that is located between the upper bar 75 and the guide bar may not closely adhere to the module cover 15. Alternatively, the central part of the link 73 may not closely adhere to the module cover 15. The central part of the link 73 may be a portion adjacent to the arm joint 152. In this case, distances APRD1 and APLD2 between the module cover 15 and the link 73 may not be constant. In this case, the display panel 10 may be bent or curved.

Referring to FIG. 52, if the magnet 64 is located in the depressed portion 321 of the link 73, the module cover 15 may also be closely attached to the magnet 64 because the magnet 64 attracts the panel protection portion 97. That is, the central part of the link 73 may be closely attached to the module cover 15.

Referring to FIGS. 53 and 54, an assistant roller 556 may be spaced apart from the panel roller 143. The assistant roller 556 may be connected to a protection sheet 472. The protection sheet 472 may have one end connected to the assistant roller 556 and the other end connected to the display panel 10. The assistant roller 556 may be wound or unwound by the protection sheet 472. The protection sheet 472 may include non-woven fabric.

The assistant roller 556 may be located adjacent to a portion on which the panel roller 143 is wound. The assistant roller 556 may be rotated in a direction opposite the direction in which the panel roller 143 is rotated. That is, when the panel roller 143 unwinds the display panel 10, the assistant roller 556 may wind the protection sheet 472. Furthermore, when the panel roller 143 winds the display panel 10, the assistant roller 556 unwinds the protection sheet 472.

Referring to FIG. 53, if the protection sheet 472 is not used, when the panel roller 143 winds the module cover 15 and the display panel 10, the module cover 15 and the display panel 10 may rub against each other. The display panel 10 may be damaged due to frication with the module cover 15.

Referring to FIG. 54, the display panel 10, the module cover 15, and the protection sheet 472 may be together wound on or unwound from the panel roller 143. When the display panel 10, the module cover 15, and the protection sheet 472 are wound on the panel roller 154, the protection sheet 472 may be located between the module cover 15 and the display panel 10. The protection sheet 472 can prevent friction between the module cover 15 and the display panel 10. Damage to the display panel 10 can be prevented because the protection sheet 472 prevents friction between the module cover 15 and the display panel 10.

Referring to FIG. 55, the assistant roller 556 may include a fixing cap 521, a rotating cap 523, a shaft 547, a coil spring 573, and a roller cover 582.

The coil spring 573 may be disposed within the assistant roller 556. The length direction of the coil spring 573 and the length direction of the assistant roller 556 may be parallel.

The fixing cap 521 may be located at one end of the assistant roller 556. The fixing cap 521 may be coupled to one end of the coil spring 573. The fixing cap 521 may be fixed regardless of the rotation of the roller cover 582. The fixing cap 521 may not rotate.

The rotating cap 523 may be located at the other end of the assistant roller 556. The rotating cap 523 may be coupled to the other end of the coil spring 573. The rotating cap 523, together with the roller cover 582, may be rotated when the roller cover 582 is rotated.

When the roller cover 582 rotates, the fixing cap 521 on one side does not rotate, the rotating cap 523 may rotate along with the roller cover 582, and the coil spring 573 may be elastically deformed. The coil spring 573 may store energy while being elastically deformed, and may apply a restoring force to the rotating cap 523. The restoring force of the coil spring 573 may act in a direction opposite the rotating direction of the rotating cap 523.

Accordingly, as the protection sheet 472 is unwound from the assistant roller 556, a force that winds the protection sheet 472 on the assistant roller 556 again may act on the assistant roller 556. That is, when the display panel is unwound from the panel roller, the protection sheet 472 may be wound on the assistant roller 556.

Furthermore, as the protection sheet 472 is wound on the assistant roller 556, a force that unwinds the protection sheet 472 from the assistant roller 556 again may act on the assistant roller 556. That is, when the display panel is wound on the panel roller, the protection sheet 472 may be unwound from the assistant roller 556.

The shaft 547 may be the central axis of the assistant roller 556. The shaft 547 may be connected to the fixing cap 521. The coil spring 573 may be fit into the shaft 547. The shaft 547 may assist the coil spring 573 so that it is stably located within the assistant roller 556.

The roller cover 582 may form an external appearance of the assistant roller 556. The roller cover 582 may accommodate the fixing cap 521, the rotating cap 523, the shaft 547, and the coil spring 573. The roller cover 582 may be connected to one end of the protection sheet 472. That is, the protection sheet 472 may be wound on the roller cover 582.

Referring to FIG. 56, a radius formed by the panel roller 143 and the display panel 10 wound on the panel roller 143 may be referred to as R1. A value of R1 may vary depending on the degree that the display panel 10 is wound on the panel roller 143. The radius of the panel roller 143 may be referred to as R2.

The panel roller 143 may be fixed within the housing 30. Furthermore, the entrance 30 a of the housing through which the display panel passes may be fixed within the housing 30. Accordingly, an angle formed by the display panel 10 unwound from the panel roller 143 and the base 31 within the housing may vary depending on R1.

If the display panel 10 has been sufficiently unwound from the panel roller 143, a radius formed by the panel roller 143 and the display panel 10 wound on the panel roller 143 may be R2. In this case, the display panel 10 may be inclined against the base at an angle A1. If the display panel 10 is inclined against the base, the rising or falling of the display panel 10 may become unstable.

Referring to FIG. 57, the guide assembly 731 may be coupled to the assistant roller 556.

The assistant roller 556 can prevent the display panel 10 from inclining with respect to the base 31. The assistant roller 556 may stably guide the display panel 10 unwound from the panel roller 143. However, a radius/diameter formed by the assistant roller 556 and the protection sheet 472 wound on the assistant roller 556 may vary depending on the degree that the protection sheet 472 is wound on the assistant roller 556.

The guide assembly 731 is coupled to the assistant roller 556, and may adjust the location of the assistant roller 556 depending on the degree that the protection sheet 472 is wound on the assistant roller 556. Accordingly, the assistant roller 556 can stably guide the display panel 10 unwound from the panel roller 143 although a radius/diameter formed by the assistant roller 556 and the protection sheet 472 unwound from the assistant roller 556 varies.

The guide assembly 731 may include a guide arm 752, a pin bolt 761, a tension spring 764, and a supporter 772. The guide arm 752 may have one end connected to the assistant roller 556 and the other end connected to the tension spring 764. The guide arm 752 may be rotated around the pin bolt 761. The pin bolt 761 may be fixed to the housing. The assistant roller 556 is connected to the guide arm 752 and may be rotated around the pin bolt 761.

The tension spring 764 may have one end connected to the guide arm 762 and the other end connected to the supporter 772. The supporter 772 may be fixed to the housing.

When the panel roller 143 is unwound from the display panel 10, the assistant roller 556 may be wound on the protection sheet 472, and a radius/diameter formed by the assistant roller 556 and the protection sheet 472 wound on the assistant roller 556 may be increased. Furthermore, the assistant roller 556 may be rotated counterclockwise around the pin bolt 761. In this case, the tension spring 764 may apply a force so that the guide arm 752 is rotated clockwise. The tension spring 764 can prevent the assistant roller 556 from excessively rotating counterclockwise around the pin bolt 761.

When the display panel 10 is wound on the roller 143, the protection sheet 472 may be unwound from the assistant roller 556, and a radius/diameter formed by the assistant roller 556 and the protection sheet 472 wound on the assistant roller 556 may be decreased. Furthermore, the assistant roller 556 may be rotated clockwise around the pin bolt 761.

In this case, the tension spring 764 can prevent the assistant roller 556 from rotating counterclockwise around the pin bolt 761.

Hereinafter, a configuration and operation different from those of the aforementioned embodiments are chiefly described, and the same or similar configuration as that of the aforementioned embodiments is omitted in order to avoid redundancy.

Referring to FIG. 58, a motor assembly 810 may be installed on the base 31. The base 31 may be the base side of the housing 30. The driving shafts of the motor assembly 810 may be formed on both sides. The right driving shaft and left driving shaft of the motor assembly 810 may be rotated in the same direction. Alternatively, the right driving shaft and left driving shaft of the motor assembly 810 may be rotated in opposite directions.

The motor assembly 810 may include a plurality of motors. The plurality of motors may be connected in series. The plurality of motors may include a first motor 811, a second motor 812, a third motor 813, and a fourth motor 814 sequentially disposed from the right side to the left side. The right driving shaft of the motor assembly 810 may be formed in the first motor 811. Furthermore, the left driving shaft of the motor assembly 810 may be formed in the fourth motor 814. The motor assembly 810 can output high torque because the plurality of motors is connected in series.

The motor assembly 810 may be connected to lead screws 840 a and 840 b. The lead screws 840 a and 840 b may include a right lead screw 840 a connected to the right side of the motor assembly 810 and a left lead screw 840 b connected to the left side of the motor assembly 810. The right lead screw 840 a may also be referred to as a first lead screw 840 a. The left lead screw 840 b may also be referred to as a second lead screw 840 b.

The right driving shaft of the motor assembly 810 may be connected to the right lead screw 840 a. Alternatively, the right driving shaft of the motor assembly 810 and the right lead screw 840 a may be connected through a right coupling 820 a. Alternatively, the driving shaft of the first motor 811 may be connected to the right lead screw 840 a. Alternatively, the driving shaft of the first motor 811 and the right lead screw 840 a may be connected through the right coupling 820 a. The right driving shaft may also be referred to as a first driving shaft. The left driving shaft may also be referred to as a second driving shaft.

The left driving shaft of the motor assembly 810 may be connected to the left lead screw 840 b. Alternatively, the left driving shaft of the motor assembly 810 and the left lead screw 840 b may be connected through the left coupling 820 b. Alternatively, the driving shaft of the fourth motor 814 may be connected to the left lead screw 840 b. Alternatively, the driving shaft of the fourth motor 814 and the left lead screw 840 b may be connected through the left coupling 820 b.

The couplings 820 a and 820 b may include the right coupling 820 a that connects the right driving shaft of the motor assembly 810 and the right lead screw 840 a and the left coupling 820 b that connects the left driving shaft of the motor assembly 810 and the left lead screw 840 b.

Screw threads may be formed in the lead screws 840 a and 840 b in the length direction. The screw thread formed in the right lead screw 840 a and the screw thread formed in the left lead screw 840 b may have opposite directions. Alternatively, the screw thread formed in the right lead screw 840 a and the screw thread formed in the left lead screw 840 b may have the same direction.

Bearings 830 a, 830 b, 830 c, and 830 d may be installed on the base 31. A plurality of the bearings 830 a, 830 b, 830 c, and 830 d may be formed in the length direction of the base 31. The bearings 830 a, 830 b, 830 c, and 830 d may include right bearings 830 a, 830 b, 830 c, and 830 d disposed on the right side of the motor assembly 810 and left bearings 830 a, 830 b, 830 c, and 830 d disposed on the left side of the motor assembly 810.

The bearings 830 a, 830 b, 830 c, and 830 d may support the lead screws 840 a and 840 b. The lead screws 840 a and 840 b may be connected to the driving shaft of the motor assembly 810 and may rotate around the driving shaft. The bearings 830 a, 830 b, 830 c, and 830 d may support the lead screws 840 a and 840 b while not hindering the rotation of the lead screws 840 a and 840 b.

The right bearings 830 a, 830 b, 830 c, and 830 d may support the right lead screw 840 a. The right bearings 830 a, 830 b, 830 c, and 830 d may include the first right bearing 830 a that supports the right side of the right lead screw 840 a and the second right bearing 830 b that supports the left side of the right lead screw 840 a. The first right bearing 830 a may also be referred to as a first bearing 830 a. The second right bearing 830 b may also be referred to as a second bearing 830 b.

The left bearings 830 a, 830 b, 830 c, and 830 d may support the left lead screw 840 b. The left bearings 830 a, 830 b, 830 c, and 830 d may include the first left bearing 830 c that supports the right side of the left lead screw 840 b and the second left bearing 830 d that supports the left side of the left lead screw 840 b.

In the bearings 830 a, 830 b, 830 c, and 830 d, the couplings 820 a and 820 b, and the motor assembly 810, the first right bearing 830 a, the second right bearing 830 b, the right coupling 820 a, the motor assembly 810, the left coupling 820 b, the first left bearing 830 c, and the second left bearing 830 d may be sequentially disposed from the right side to the left side.

Referring to FIGS. 59 and 60, the display device may further include a slider 860 a, 860 b. The slider 860 a, 860 b may be coupled to the lead screws 840 a and 840 b. The lead screws 840 a and 840 b may be disposed to penetrate the slider 860 a, 860 b. A plurality of the sliders 860 a and 860 b may be formed. The sliders 860 a and 860 b may include a right slider 860 a coupled to the right lead screw 840 a and a left slider 860 b coupled to the left lead screw 840 b. The right slider 860 a may also be referred to as a first slider 860 a. The left slider 860 b may also be referred to as a second slider 860 b.

Screw threads SS may be formed in the inner circumferential surfaces of the sliders 860 a and 860 b. The screw threads SS formed in the inner circumferential surfaces of the sliders 860 a and 860 b and screw threads RS and LS formed in the lead screws 840 a and 840 b may be engaged with each other. The sliders 860 a and 860 b may advance or retreat in the length direction of the lead screws 840 a and 840 b as the lead screws 840 a and 840 b are rotated.

The right slider 860 a may be engaged with the right lead screw 840 a. As the right lead screw 840 a is rotated, the right slider 860 a may advance or retreat between the first right bearing 830 a and the second right bearing 830 b.

The left slider 860 b may be engaged with the left lead screw 840 b. When the left lead screw 840 b is rotated, the left slider 860 b may advance or retreat between the first left bearing 830 c and the second left bearing 830 d.

The right slider 860 a may be spaced apart from the symmetry axis “ys” of the motor assembly 810 at a distance RD1. The left slider 860 b may be spaced apart from the symmetry axis “ys” of the motor assembly 810 at a distance LD1. The distance RD1 and the distance LD1 may have the same length. That is, the right slider 860 a and the left slider 860 b may be symmetrical to each other based on the symmetry axis “ys” of the motor assembly 810.

The rotating direction of the right driving shaft and the rotating direction of the left driving shaft may become the same by the motor assembly 810. Furthermore, the screw thread RS of the right lead screw 840 a and the screw thread LS of the left lead screw 840 b may have opposite directions. Accordingly, if the right slider 860 a moves in the +x-axis direction as the right driving shaft rotates, the left slider 860 b may move in the −x-axis direction as the left driving shaft rotates. Alternatively, when the right slider 860 a moves in the −x-axis direction as the right driving shaft rotates, the left slider 860 b may move in the +x-axis direction as the left driving shaft rotates.

Referring to FIG. 61, the screw thread RS of the right lead screw 840 a and the screw thread LS of the left lead screw 840 b may have opposite directions. The right lead screw 840 a may have a pitch PL, and the left lead screw 840 b may have a pitch PR. The pitch PL of the right lead screw 840 a and the pitch PR of the left lead screw 840 b may have the same length.

The output of the right driving shaft and the output of the left driving shaft may become the same by the motor assembly 810. The rotating direction Ra of the right driving shaft and the rotating direction Ra of the left driving shaft may be the same. Furthermore, the number of revolutions of the right driving shaft per unit time and the number of revolutions of the left driving shaft per unit time may be the same. Furthermore, the torque of the right driving shaft and the torque of the left driving shaft may have the same direction. Furthermore, the amount of torque of the right driving shaft and the amount of torque of the left driving shaft may be the same.

The right slider 860 a may move from the location where the right slider 860 a has been spaced apart from the symmetry axis “ys” of the motor assembly 810 at the distance RD1 to the +x-axis direction as the right driving shaft rotates. When the right driving shaft rotates n times, the right slider 860 a may be spaced apart from the symmetry axis “ys” of the motor assembly 810 at a distance LD2. In this case, the distance RD1 and the distance LD2 may have a difference corresponding to “(the number of revolutions n)*(the pitch PL of the right slider 860 a).”

The left slider 860 b may move from the location where the left slider 860 b has been spaced apart from the symmetry axis “ys” of the motor assembly 810 at the distance LD1 to the −x axis direction as the left driving shaft rotates. When the left driving shaft rotates n times, the left slider 860 b may be spaced apart from the symmetry axis “ys” of the motor assembly 810 at a distance RD2. In this case, the distance LD1 and the distance RD2 may have a difference corresponding to “(the number of revolutions n)*(the pitch PL of the left slider 860 b).”

That is, if the pitch PR of the right slider 860 a and the pitch PL of the left slider 860 b are the same, the right slider 860 a and the left slider 860 b may have the same displacement, but have opposite directions.

Furthermore, if the initial locations of the right slider 860 a and the left slider 860 b are symmetrical to the symmetry axis “ys” of the motor assembly 810, the right slider 860 a and the left slider 860 b may become distant from each other while maintaining symmetry with respect to the symmetry axis “ys” of the motor assembly 810.

Referring to FIG. 62, the right slider 860 a may move from the location where the right slider 860 a has been spaced apart from the symmetry axis “ys” of the motor assembly 810 at the distance RD2 to the −x axis direction as the right driving shaft rotates. The rotating direction Rb of the right driving shaft and the rotating direction Rb of the left driving shaft may be the same. When the right driving shaft rotates n times, the right slider 860 a may be spaced apart from the symmetry axis “ys” of the motor assembly 810 at the distance RD1. In this case, the distance RD1 and the distance RD2 may have a difference corresponding to “(the number of revolutions n)*(the pitch PR of the right slider 860 a).”

The left slider 860 b may move from the location where the left slider 860 b has been spaced apart from the symmetry axis “ys” of the motor assembly 810 at the distance LD2 to the +x-axis direction as the left driving shaft rotates. When the left driving shaft rotates n times, the left slider 860 b may be spaced apart from the symmetry axis “ys” of the motor assembly 810 at the distance LD1. In this case, the distance LD1 and the distance LD2 may have a difference corresponding to “(the number of revolutions n)*(the pitch PL of the left slider 860 b).”

That is, if the pitch PR of the right slider 860 a and the pitch PL of the left slider 860 b are the same, the right slider 860 a and the left slider 860 b may have the same displacement, but have opposite directions.

Furthermore, if the initial locations of the right slider 860 a and the left slider 860 b are symmetrical to the symmetry axis “ys” of the motor assembly 810, the right slider 860 a and the left slider 860 b may become close to each other while maintaining symmetry with respect to the symmetry axis “ys” of the motor assembly 810.

Referring to FIG. 63, the motor assembly 810 may make the right driving shaft Ra and the left driving shaft Rb have opposite rotating directions. The screw thread RS of the right lead screw 840 a and the screw thread LS′ of the left lead screw 840 b may have the same direction. Accordingly, when the right slider 860 a moves in the +x-axis direction as the right driving shaft rotates, the left slider 860 b may move in the +x-axis direction as the left driving shaft rotates. Alternatively, when the right slider 860 a moves in the +x-axis direction as the right driving shaft rotates, the left slider 860 b may move in the −x-axis direction as the left driving shaft rotates.

The right lead screw 840 a may have the pitch PR, and the left lead screw 840 b may have the pitch PL. The pitch PR of the right lead screw 840 a and the pitch PL of the left lead screw 840 b may be formed to have the same length.

The right driving shaft and the left driving shaft may have the same output by the motor assembly 810. The rotating direction of the right driving shaft and the rotating direction of the left driving shaft may be opposite. Furthermore, the number of revolutions of the right driving shaft per unit time and the number of revolutions of the left driving shaft per unit time may be the same. Furthermore, the torque of the right driving shaft and the torque of the left driving shaft may have opposite directions. Furthermore, the amount of torque of the right driving shaft and the amount of torque of the left driving shaft may be the same.

The right slider 860 a may move from the location where the right slider 860 a has been spaced apart from the symmetry axis “ys” of the motor assembly 810 at the distance RD1 to the +x-axis direction as the right driving shaft rotates. When the right driving shaft rotates n times, the right slider 860 a may be spaced apart from the symmetry axis “ys” of the motor assembly 810 at the distance RD2. In this case, the distance RD1 and the distance RD2 may have a difference corresponding to “(the number of revolutions n)*(the pitch PR of the right slider 860 a).”

The left slider 860 b may move from the location where the left slider 860 b has been spaced apart from the symmetry axis “ys” of the motor assembly 810 at the distance LD1 to the −x-axis direction as the left driving shaft rotates. When the left driving shaft rotates n times, the left slider 860 b may be spaced apart from the symmetry axis “ys” of the motor assembly 810 at the distance LD2. In this case, the distance LD1 and the distance LD2 may have a difference corresponding to “(the number of revolutions n)*(the pitch PL of the left slider 860 b).”

That is, if the pitch PL of the right slider 860 a and the pitch PR of the left slider 860 b are the same, the right slider 860 a and the left slider 860 b may have the same displacement, but have opposite directions.

Furthermore, if the initial locations of the right slider 860 a and the left slider 860 b are symmetrical to the symmetry axis “ys” of the motor assembly 810, the right slider 860 a and the left slider 860 b may become distant from each other while maintaining symmetry with respect to the symmetry axis “ys” of the motor assembly 810.

Referring to FIG. 64, the motor assembly 810 may make the right driving shaft Rb and the left driving shaft Ra have opposite rotating directions. The right slider 860 a may move from the location where the right slider 860 a has been spaced apart from the symmetry axis “ys” of the motor assembly 810 at the distance RD2 to the −x-axis direction as the right driving shaft rotates. When the right driving shaft rotates n times, the right slider 860 a may be spaced apart from the symmetry axis “ys” of the motor assembly 810 at the distance RD1. In this case, the distance RD1 and the distance RD2 may have a difference corresponding to “(the number of revolutions n)*(the pitch PR of the right slider 860 a).”

The left slider 860 b may move from the location where the left slider 860 b has been spaced apart from the symmetry axis “ys” of the motor assembly 810 at the distance LD2 to the +x-axis direction as the left driving shaft rotates. When the left driving shaft rotates n times, the left slider 860 b may be spaced apart from the symmetry axis “ys” of the motor assembly 810 at the distance LD1. In this case, the distance LD1 and the distance LD2 may have a difference corresponding to “(the number of revolutions n)*(the pitch PL of the left slider 860 b).”

That is, if the pitch PR of the right slider 860 a and the pitch PL of the left slider 860 b are the same, the right slider 860 a and the left slider 860 b may have the same displacement, but have opposite directions.

Furthermore, if the initial locations of the right slider 860 a and the left slider 860 b are symmetrical to the symmetry axis “ys” of the motor assembly 810, the right slider 860 a and the left slider 860 b may become close to each other while maintaining symmetry with respect to the symmetry axis “ys” of the motor assembly 810.

Referring to FIGS. 65 to 68, link mounts 920 a and 920 b may be installed on the base 31. The link mounts 920 a and 920 b may include a right link mount 920 a spaced apart from the first right bearing 830 a to the right side and a left link mount 920 b spaced apart from the second left bearing 830 d to the left side.

Links 910 a and 910 b may be connected to the link mounts 920 a and 920 b. The links 910 a and 910 b may include a right link 910 a connected to the right link mount 920 a and a left link 910 b connected to the left link mount 920 b.

The right link 910 a may also be referred to as a first link. The left link 910 b may also be referred to as a second link. The right link mount 920 a may also be referred to as a first link mount 920 a. The left link mount 920 b may also be referred to as a second link mount 920 b.

The links 910 a and 910 b may include first arms 911 a and 911 b, second arms 912 a and 912 b, and arm joints 913 a and 913 b, respectively. One side of each of the second arms 912 a and 912 b may be pivotally connected to each of the link mounts 920 a and 920 b. The other side of each of the second arms 912 a and 912 b may be pivotally connected to each of the arm joints 913 a and 913 b. One side of each of the first arms 911 a and 911 b may be pivotally connected to each of the arm joints 913 a and 913 b. The other side of each of the first arms 911 a and 911 b may be pivotally connected to each of link brackets 951 a and 951 b.

The link brackets 951 a and 951 b may include a right link bracket 951 a connected to the first arm 911 a of the right link 910 a and a left link bracket 951 b connected to the first arm 911 b of the left link 910 b. The link brackets 951 a and 951 b may be connected to an upper bar 950.

The upper bar 950 may connect the right link bracket 951 a and the left link bracket 951 b.

Rods 870 a and 870 b may connect the sliders 860 a and 860 b and the links 910 a and 910 b, respectively. One side of each of the rods 870 a and 870 b may be pivotally connected to each of the sliders 860 a and 860 b. The other side of each of the rods 870 a and 870 b may be pivotally connected to each of the second arms 912 a and 912 b. The rods 870 a and 870 b may include a right rod 870 a that connects the right slider 860 a and the second arm 912 a of the right link 910 a and a left rod 870 b that connects the left slider 860 b and the second arm 912 b of the left link 910 b. The right rod 870 a may also be referred to as a first rod 870 a. The left rod 870 b may also be referred to as a second rod 870 b.

More specifically, a structure formed by the right lead screw 840 a, the right slider 860 a, the right rod 870 a, and the right link 910 a is described. The right slider 860 a may include a body 861 a and a rod mount 862 a. The screw thread SS may be formed in the inner circumferential surface of the body 861 a. The screw thread formed in the body 861 a may be engaged with the screw thread RS of the right lead screw 840 a. The right lead screw 840 a may penetrate the body 861 a.

The rod mount 862 a may be formed on the right side of the body 861 a. The rod mount 862 a may be pivotally connected to one side of the right rod 870 a. The rod mount 862 a may include a first rod mount 862 a 1 and a second rod mount 862 a 2. The first rod mount 862 a 1 may be disposed at the front of the right lead screw 840 a. The second rod mount 862 a 2 may be disposed at the back of the right lead screw 840 a. The first rod mount 862 a 1 and the second rod mount 862 a 2 may be spaced apart from each other. The second rod mount 862 a 2 may be spaced apart from the first rod mount 862 a 1 to the −z-axis direction. The right lead screw 840 a may be located between the first rod mount 862 a 1 and the second rod mount 862 a 2.

The rod mount 862 a may be pivotally connected to one side of the rod 870 a through a connecting member C1. The connecting member C1 may penetrate the rod mount 862 a and the right rod 870 a.

The right rod 870 a may be pivotally connected to the second arm 912 a through a connecting member C2. The connecting member C2 may penetrate the second arm 912 a and the right rod 870 a.

The right rod 870 a may include a transfer portion 871 a connected to the second arm 912 a of the right link 910 a and a cover 872 a connected to the rod mount 862 a of the right slider 860 a. The transfer portion 871 a may transfer a force, generated when the right slider 860 a advances or retreats along the right lead screw 840 a, to the right link 910 a.

The cover 872 a may include a first plate 873 a disposed at the front of the right lead screw 840 a. The first plate 873 a may be disposed in a direction vertical to the base 31. Alternatively, the first plate 873 a may face the right lead screw 840 a.

The cover 872 a may include a second plate 874 a disposed at the back of the right lead screw 840 a. The second plate 874 a may be disposed in a direction vertical to the base 31. Alternatively, the second plate 874 a may face the right lead screw 840 a. Alternatively, the second plate 874 a may be spaced apart from the first plate 873 a. The right lead screw 840 a may be located between the first plate 873 a and the second plate 874 a.

The cover 872 a may include a third plate 875 a that connects the first plate 873 a and the second plate 874 a. The third plate 875 a may be connected to the transfer portion. The third plate 875 a may be located over the right lead screw 840 a.

The cover 872 a may include a fourth plate 876 a that connects the first plate 873 a and the second plate 874 a. The fourth plate 876 a may be connected to the third plate 875 a. The fourth plate 876 a may be located over the right lead screw 840 a.

One side of the first plate 873 a may be connected to the first rod mount 862 a 1. The first plate 873 a and the first rod mount 862 a 1 may be connected through a connecting member C1′. The other side of the first plate 873 a may be connected to the third plate 875 a.

One side of the second plate 874 a may be connected to the second rod mount 862 a 2. The second plate 874 a and the second rod mount 862 a 2 may be connected through the connecting member C1. The other side of the second plate 874 a may be connected to the third plate 875 a.

When the right slider 860 a moves close to the motor assembly 810, the right lead screw 840 a and the right rod 870 a may come into contact with each other. When the right lead screw 840 a and the right rod 870 a come into contact with each other, interference may be generated therebetween and thus a movement of the right slider 860 a may be limited.

The cover 872 a may provide a space S1 therein. The first plate 873 a, the second plate 874 a, the third plate 875 a, and the fourth plate 876 a may form the space S1. When the right slider 860 a moves close to the motor assembly 810, the right lead screw 840 a may be accommodated or escaped into the space S1 provided by the cover 872 a. The right slider 860 a may move close to the motor assembly 810 due to the space S1 provided by the cover 872 a, compared to a case where the cover 872 a is not present. That is, a movable range of the right slider 860 a can be increased because the cover 872 a provides the space S1 therein. Furthermore, there is an advantage in that the size of the housing 30 can be reduced because the right lead screw 840 a is accommodated in the cover 872 a.

Furthermore, the cover 872 a may limit a minimum value of an angle “theta S” formed by the second arm 912 a and the base 31. When the angle “theta S” is sufficiently small, the third plate 875 a of the cover 872 a may come into contact with the second arm 912 a and support the second arm 912 a. Since the third plate 875 a supports the second arm 912 a, a minimum value of the angle “theta S” can be limited and the sagging of the second arm 912 a can be prevented. That is, the cover 872 a may play the role of a stopper to prevent the sagging of the second arm 912 a. Furthermore, since the third plate 875 a limits a minimum value of the angle “theta S”, an initial load for standing the second arm 912 a can be reduced.

The lead screws 840 a and 840 b may be driven by the single motor assembly 810. Since the lead screws 840 a and 840 b are driven by the single motor assembly 810, the second arms 912 a and 912 b can stand up while forming symmetry. If the lead screws 840 a and 840 b are driven by the single motor assembly 810, however, a load applied to the motor assembly 810 to stand the second arms 912 a and 912 b may be excessively increased. In this case, the third plate 875 a may limit a minimum value of the angle “theta S”, thereby being capable of reducing a load applied to the motor assembly 810 in order to stand the second arms 912 a and 912 b.

A structure formed by the left lead screw 840 b, the left slider 860 b, the left rod 870 b, and the left link 910 b may be symmetrical to the structure formed by the right lead screw 840 a, the right slider 860 a, the right rod 870 a, and the right link 910 a. In this case, the symmetry axis may be the symmetry axis “ys” of the motor assembly 810.

In the present disclosure, the disclosed structure to raise and lower the flexible display may be referred to herein as a lift assembly. The lift assembly may include various components including lever assemblies. The lever assemblies may include various components including a plurality of arms in linkage with each other and may be provided in plurality, e.g., on the left and right sides.

FIGS. 60 and 70 are diagrams showing that the right rod 870 a has been connected to a protruding portion 914 a. The protruding portion 914 a may also be referred to as a connecting portion 914 a.

An angle formed by the right rod 870 a and the base 31 may be different depending on the location of the connecting portion. An angle formed by the second arm 912 a and the base 31 may be called an angle “theta S”. If the right slider 860 a is located close to the motor assembly 810 within its movable range, the second arm 912 a may be said to be the state in which it has fully lain down with respect to the base 31. If the second arm 912 a has fully lain down with respect to the base 31, the angle “theta S” may have a minimum value. For example, if the second arm 912 a has fully lain down with respect to the base 31, the angle “theta S” may have a value close to 0 degree.

When the right slider 860 a moves to the +x-axis direction, the angle “theta S” may gradually increase. Alternatively, when the right slider 860 a moves to the +x-axis direction, it may be said that the second arm 912 a stands up with respect to the base 31. Alternatively, if the angle “theta S” gradually increases, it may be said that the second arm 912 a stands up with respect to the base 31.

If the right slider 860 a is located farthest from the motor assembly 810 within the movable range, it may be said that the second arm 912 a has fully stood up with respect to the base 31. If the second arm 912 a has fully stood up with respect to the base 31, the angle “theta S” may have a maximum value. For example, if the second arm 912 a has fully stood up with respect to the base 31, the second arm 912 a may be vertical to the base 31. Alternatively, if the second arm 912 a has fully stood up with respect to the base 31, an angle formed by the base 31 may have a value close to 90 degrees.

The direction in which an angle “theta S” formed by the second arm 912 a of the right link 910 a and the base 31 increases may be called a standing direction S. Alternatively, the direction in which an angle formed by the second arm 912 a of the left link 910 b and the base 31 increases may be called a standing direction S.

If a rod mount 862 a″ is located over the body 861 a, an angle formed by a right rod 870 a″ and the base 31 may be called an angle “theta A”, and a minimum force that is necessary for the right rod 870 a″ to stand the second arm 912 a may be called Fa.

If a rod mount 862 a′ is located in the middle height of the body 861 a, an angle formed by the right rod 870 a′ and the base 31 may be called “theta B”, and a minimum force that is necessary for the right rod 870 a′ to stand the second arm 912 a may be called Fb.

If the rod mount 862 a is located on the lower side of the body 861 a, an angle formed by the right rod 870 a and the base 31 may be called “theta C”, and a minimum force that is necessary for the right rod 870 a to stand the second arm 912 a may be called Fc.

In this case, a relation “theta A<theta B<theta B” may be established with respect to the same angle “theta S.” Furthermore, a relation “Fc<Fb<Fa” may be established with respect to the same angle “theta S.”

That is, if the second arm 912 a and the base 31 form the same angle, a force required to stand the second arm 912 a may be reduced as an angle formed by the right rod 870 a and the base 31 increases.

The cover 872 a of the right rod 870 a may provide the space S1 in which the right lead screw 840 a can be accommodated, so the rod mount 862 a can be coupled close to the lower side of the body 861 b or the right lead screw 840 a.

The lead screws 840 a and 840 b may be driven by the single motor assembly 810. Since the lead screws 840 a and 840 b are driven by the single motor assembly 810, the second arms 912 a and 912 b can stand up while forming symmetry. If lead screws 840 a and 840 b are driven by the single motor assembly 810, however, a load applied to the motor assembly 810 in order to stand the second arms 912 a and 912 b may be excessively increased. In this case, a load applied to the motor assembly 810 in order to stand the second arm 912 a can be reduced by increasing the angle formed by the right rod 870 a and the base 31.

A structure formed by the left lead screw 840 b, the left slider 860 b, the left rod 870 b, and the second arm 912 b may be symmetrical to the structure formed by the right lead screw 840 a, the right slider 860 a, the right rod 870 a, and the second arm 912 a. In this case, the symmetry axis may be the symmetry axis “ys” of the motor assembly 810.

Referring to FIGS. 71 to 73, the second arm 912 a and 912 a′ may include a bar 915 a and 915 a′ and a protruding portion 914 a. FIG. 71 is a diagram showing that the right rod 870 a′ has been connected to the bar 915 a′. FIG. 72 is a diagram showing that the right rod 870 a has been connected to the protruding portion 914 a. The protruding portion 914 a may also be referred to as a connecting portion 914 a.

An angle formed by the second arm 912 a and 912 a′ and the base 31 may be called “theta S.” If the right slider 860 a is located closest to the motor assembly 810 within its movable range, it may be said to be the state in which the second arm 912 a and 912 a′ has fully lain down with respect to the base 31. If the second arm 912 a has fully lain down with respect to the base 31, the angle “theta S” may have a minimum value. For example, if the second arm 912 a and 912 a′ has fully lain down with respect to the base 31, the angle “theta S” may have a value close to 0 degree.

When the right slider 860 a moves to the +x-axis direction, the angle “theta S” may gradually increase. Alternatively, when the right slider 860 a moves to the +x-axis direction, it may be said that the second arm 912 a and 912 a′ stands up with respect to the base 31. Alternatively, when the angle “theta S” gradually increases, it may be said that the second arm 912 a stands up with respect to the base 31.

If the right slider 860 a is located farthest from the motor assembly 810 within the movable range, it may be said that the second arm 912 a and 912 a′ has fully stood up with respect to the base 31. If the second arm 912 a has fully stood up with respect to the base 31, the angle “theta S” may have a maximum value. For example, if the second arm 912 a and 912 a′ has fully stood up with respect to the base 31, the second arm 912 a and 912 a′ may be vertical to the base 31. Alternatively, if the second arm 912 a and 912 a′ has fully stood up with respect to the base 31, an angle formed by the base 31 may have a value close to 90 degrees.

The direction in which the angle “theta S” formed by the second arm 912 a and 912 a′ of the right link 910 a and the base 31 increases may be called a standing direction S. Alternatively, the direction in which the angle formed by the second arm 912 a of the left link 910 b and the base 31 increases may be called a standing direction S.

Referring to FIG. 71, an angle formed by the right rod 870 a and the right lead screw 840 a may be called “theta 1.” If the second arm 912 a′ has fully lain down with respect to the base 31, the angle “theta 1” may have a minimum value.

In order to stand the second arm 912 a′, the motor assembly 810 may rotate the driving shaft. When the driving shaft rotates, the right slider 860 a may move to the +x-axis direction. The right slider 860 a may apply a force to the right rod 870 a′, and the rod 870 a′ may transfer the force to the bar 915 a′ of the second arm 912 a′. The second arm 912 a′ may receive the force from the right rod 870 a′ and rotate to the standing direction S. When the right link 910 a stands up, the angle “theta S” and the angle “theta 1” may increase.

If the second arm 912 a′ has fully lain down with respect to the base 31, a minimum force for standing the second arm 912 a′ may be called F1. That is, the minimum force F1 may mean a minimum force that needs to be transferred from the right rod 870 a′ to the bar 915 a′ of the second arm 912 a′ in order to stand the second arm 912 a′.

Referring to FIG. 72, an angle formed by the right rod 870 a and the right lead screw 840 a may be called “theta 2.” If the second arm 912 a has fully lain down with respect to the base 31, the angle “theta 2” may have a minimum value.

In order to stand the second arm 912 a, the motor assembly 810 may rotate the driving shaft. When the driving shaft rotates, the right slider 860 a may move to the +x-axis direction and the left slider 860 b may move to the −x-axis direction. The sliders 860 a and 860 b may apply a force to the rods 870 a and 870 b, and the rods 870 a and 870 b may transfer the force to the bar 915 a of the second arm 912 a. The second arm 912 a may receive the force from the rods 870 a and 870 b and rotate to the standing direction S. When the links 910 a and 910 b stand up, the angle “theta S” and the angle “theta 2” may increase.

If the second arm 912 a has fully lain down with respect to the base 31, a minimum force for standing the second arm 912 a may be called F2. That is, the minimum force F2 may mean a minimum force that needs to be transferred from the right rod 870 a to the bar 915 a of the second arm 912 a in order to stand the second arm 912 a.

The case where the right rod 870 a′ is connected to the bar 915 a′ of the second arm 912 a′ and the case where the right rod 870 a is connected to the protruding portion 914 a of the second arm 912 a are compared with each other with reference to FIGS. 47 and 48. If an angle “theta S” formed by the second arm 912 a and 912 a′ and the base 31 is the same, an angle “theta 2” formed by the right lead screw 840 a and the right rod 870 a connected to the protruding portion 914 a of the second arm 912 a may be greater than an angle “theta 1” formed by the right lead screw 840 a and the right rod 870 a′ connected to the bar 915 a′ of the second arm 912 a′.

Furthermore, if an angle “theta S” formed by the second arm 912 a and 912 a′ and the base 31 is the same, the force F1 necessary to stand the second arm 912 a′ if the right rod 870 a′ has been connected to the bar 915 a′ of the second arm 912 a′ may be greater than the force F2 necessary to stand the second arm 912 a if the right rod 870 a has been connected to the protruding portion 914 a of the second arm 912 a.

That is, if an angle formed by the second arm 912 a and 912 a′ and the base 31 is the same, a force required to stand the second arm 912 a and 912 a′ may be reduced as an angle formed by the right rod 870 a, 870 a′ and the right lead screw 840 a increases. Alternatively, since the right rod 870 a is connected to the protruding portion 914 a, the second arm 912 a can be stood up by a small force compared to a case where the right rod 870 a′ is connected to the bar 915 a′.

The lead screws 840 a and 840 b may be driven by the single motor assembly 810. Since the lead screws 840 a and 840 b are driven by the single motor assembly 810, the second arms 912 a and 912 b can stand up while forming symmetry. If the lead screws 840 a and 840 b are driven by the single motor assembly 810, however, a load applied to the motor assembly 810 in order to stand the second arms 912 a and 912 b may be excessively increased. In this case, since the right rod 870 a is connected to the protruding portion 914 a of the second arm 912 a, an angle formed by the right rod 870 a and the base 31 may be increased. A load applied to the motor assembly 810 may be reduced in order to stand the second arm 912 a.

A structure formed by the left lead screw 840 b, the left slider 860 b, the left rod 870 b, and the second arm 912 b may be symmetrical to the structure formed by the right lead screw 840 a, the right slider 860 a, the right rod 870 a, and the second arm 912 a. In this case, the symmetry axis may be the symmetry axis “ys” of the motor assembly 810.

FIGS. 74 and 75 are diagrams showing that the right rod 870 a has been connected to the protruding portion 914 a. The protruding portion 914 a may also be referred to as a connecting portion 914 a.

An angle formed by the right rod 870 a and the base 31 may be different depending on the location where the protruding portion 914 a and the right rod 870 a are connected. An angle formed by the second arm 912 a and the base 31 may be called “theta S.” If the right slider 860 a is located closest to the motor assembly 810 within its movable range, it may be said to be the state in which the second arm 912 a has fully lain down with respect to the base 31. If the second arm 912 a has fully lain down with respect to the base 31, the angle “theta S” may have a minimum value. For example, if the second arm 912 a has fully lain down with respect to the base 31, the angle “theta S” may have a value close to 0 degree.

When the right slider 860 a moves to the +x-axis direction, the angle “theta S” may gradually increase. Alternatively, when the right slider 860 a moves to the +x-axis direction, it may be said that the second arm 912 a stands up with respect to the base 31. Alternatively, when the angle “theta S” gradually increases, it may be said that the second arm 912 a stands up with respect to the base 31.

If the right slider 860 a is located farthest from the motor assembly 810 within the movable range, it may be said to be the state in which the second arm 912 a has fully stood up with respect to the base 31. If the second arm 912 a has fully stood up with respect to the base 31, the angle “theta S” may have a maximum value. For example, if the second arm 912 a has fully stood up with respect to the base 31, the second arm 912 a may be vertical to the base 31. Alternatively, if the second arm 912 a has fully stood up with respect to the base 31, an angle formed by the base 31 may have a value close to 90 degrees.

The direction in which the angle “theta S” formed by the second arm 912 a of the right link 910 a and the base 31 increases may be called a standing direction S. Alternatively, the direction in which the angle formed by the second arm 912 a of the left link 910 b and the base 31 increases may be called a standing direction S.

If a right rod 870 a 1 and the protruding portion 914 a are coupled together at a distance “r” from the central axis CR of the second arm 912 a, an angle formed by the right rod 870 a 1 and the base 31 may be called “theta 2”, and a minimum force that is necessary for the right rod 870 a 1 to stand the second arm 912 a may be called F3.

If a right rod 870 a 2 and the protruding portion 914 a are coupled together at a distance r′ from the central axis CR of the second arm 912 a, an angle formed by the right rod 870 a 2 and the base 31 may be called theta 2′, and a minimum force that is necessary for the right rod 870 a 2 to stand the second arm 912 a may be called F4.

If a right rod 870 a 3 and the protruding portion 914 a are coupled together at a distance r″ from the central axis CR of the second arm 912 a, an angle formed by the right rod 870 a 3 and the base 31 may be called theta 2″, and a minimum force that is necessary for the right rod 870 a 3 to stand the second arm 912 a may be called F5.

In this case, a relation “theta 2<theta 2′<theta 2″” may be established with respect to the same angle “theta S.” Furthermore, a relation “F5<F4<F3” may be established with respect to the same angle “theta S.”

That is, if an angle formed by the second arm 912 a and the base 31 is the same, a force required to stand the second arm 912 a may be decreased as an angle formed by the right rod 870 a and the base 31 increases.

A structure formed by the left lead screw 840 b, the left slider 860 b, the left rod 870 b, and the second arm 912 b may be symmetrical to the structure formed by the right lead screw 840 a, the right slider 860 a, the right rod 870 a, and the second arm 912 a. In this case, the symmetry axis may be the symmetry axis “ys” of the motor assembly 810.

Referring to FIG. 76, a guide 850 a, 850 b, 850 c, and 850 d may be connected to a bearing 830 a, 830 b, 830 c, and 830 d. The guide 850 a, 850 b, 850 c, and 850 d may include right guides 850 a and 850 b disposed on the right side of the motor assembly 810 and left guides 850 c and 850 d disposed on the left side of the motor assembly 810.

The right guide 850 a and 850 b may have one side connected to the first right bearing 830 a and the other side connected to the second right bearing 830 b. The right guide 850 a and 850 b may be located in parallel to the right lead screw 840 a. Alternatively, the right guide 850 a and 850 b may be spaced apart from the right lead screw 840 a.

The right guide 850 a and 850 b may include a first right guide 850 a and a second right guide 850 b. The first right guide 850 a and the second right guide 850 b may be spaced apart from each other. The right lead screw 840 a may be located between the first right guide 850 a and the second right guide 850 b.

The right slider 860 a may include a protruding portion. Alternatively, the display device may include a protruding portion formed in the right slider 860 a. The protruding portion may be formed in the body of the slider. The protruding portion may include a front protruding portion that protrudes from the body 861 a of the right slider 860 a to the +z-axis direction and a back protruding portion 865 a that protrudes from the body of the slider to the −z-axis direction.

The first right guide 850 a may penetrate the back protruding portion 865 a. Alternatively, a first hole 863 a may be formed in the back protruding portion, and the first right guide 850 a may pass through the first hole 863 a. The first hole 863 a may be formed in the x-axis direction. The first hole 863 a may also be referred to as a hole 863 a.

The second right guide may penetrate the front protruding portion. Alternatively, a second hole may be formed in the front protruding portion, and the second right guide may penetrate the second hole. The second hole may be formed in the x-axis direction.

The right guides 850 a and 850 b may guide the right slider 860 a so that it moves more stably when the right slider 860 a advances or retreats along the right lead screw 840 a. Since the right guides 850 a and 850 b stably guide the right slider 860 a, the right slider 860 a may advance or retreat along the right lead screw 840 a without rotating with respect to the right lead screw 840 a.

A structure formed by the left guides 850 c and 850 d, the left bearings 830 a, 830 b, 830 c, and 830 d, the left slider 860 b, and the left lead screw 840 b may be symmetrical to the structure formed by the right guides 850 a and 850 b, the right bearings 830 a, 830 b, 830 c, and 830 d, the right slider 860 a, and the right lead screw 840 a. In this case, the symmetry axis may be the symmetry axis “ys” of the motor assembly 810.

Referring to FIG. 77, first springs 841 a and 841 b may be inserted into the lead screws 840 a and 840 b. Alternatively, the lead screws 840 a and 840 b may penetrate the first springs 841 a and 841 b. The first springs 841 a and 841 b may include a first right spring 841 a disposed on the right side of the motor assembly 810 and a first left spring 841 b disposed on the left side of the motor assembly 810.

The first right spring 841 a may be disposed between the right slider 860 a and the second right bearing 830 b. One end of the first right spring 841 a may be brought into contact with or separated from the right slider 860 a. The other end of the first right spring 841 a may be brought into contact with or separated from the second right bearing 830 b.

If the second arm 912 a has fully lain down with respect to the base 31, the distance between the right slider 860 a and the second right bearing 830 b may be a distance RD3. The first right spring 841 a may have a longer length than the distance RD3 in the state in which the first right spring 841 a has not been compressed or extended. Accordingly, if the second arm 912 a has fully lain down with respect to the base 31, the first right spring 841 a may be compressed between the right slider 860 a and the second right bearing 830 b. Furthermore, the first right spring 841 a may provide a restoring force to the right slider 860 a in the +x-axis direction.

If the second arm 912 a changes from the state in which it has fully lain down with respect to the base 31 to the standing state, a restoring force provided by the first right spring 841 a may assist the second arm 912 a to stand up. A load of the motor assembly 810 can be reduced because the first right spring 841 a assists the second arm 912 a to stand up.

The lead screws 840 a and 840 b may be driven by the single motor assembly 810. Since the lead screws 840 a and 840 b are driven by the single motor assembly 810, the second arms 912 a and 912 b can stand up while forming symmetry. If the lead screws 840 a and 840 b are driven by the single motor assembly 810, however, a load applied to the motor assembly 810 in order to stand the second arms 912 a and 912 b may be excessively increased. In this case, since the first right spring 841 a assists the second arm 912 a to stand up, a load of the motor assembly 810 can be reduced and a load applied to the motor assembly 810 in order to stand the second arm 912 a can be reduced.

Alternatively, if the second arm 912 a changes from the state in which hit has stood up with respect to the base 31 to the state in which it has fully lain down, a restoring force provided by the first right spring 841 a can reduce an impact generated when the second arm 912 a lies down with respect to the base 31. That is, when the second arm 912 a lies down with respect to the base 31, the first right spring 841 a plays the role of a damper. A load of the motor assembly 810 can be reduced because the first right spring 841 a plays the role of a damper.

A structure formed by the first left spring 841 b, the left bearings 830 a, 830 b, 830 c, and 830 d, the left slider 860 b, the left lead screw 840 b, and the second arm 912 a may be symmetrical to the structure formed by the first right spring 841 a, the right bearings 830 a, 830 b, 830 c, and 830 d, the right slider 860 a, the right lead screw 840 a, and the second arm 912 a. In this case, the symmetry axis may be the symmetry axis “ys” of the motor assembly 810.

Referring to FIG. 78, second springs 851 a and 851 b may be inserted into the guides 850 a, 850 b, 850 c, and 850 d. Alternatively, the guides 850 a, 850 b, 850 c, and 850 d may penetrate the second springs 851 a and 851 b. The second springs 851 a and 851 b may include a second right spring 851 a disposed on the right side of the motor assembly 810 and a second left spring 851 b disposed on the left side of the motor assembly 810.

A plurality of the second right springs 851 a may be formed. The second right spring 851 a may include springs 940 a and 940 b inserted into the first right guide 850 a and springs 940 a and 940 b inserted into the second right guide 850 b. Alternatively, the second right spring 851 a may include springs 940 a and 940 b through which the first right guide 850 a penetrates and springs 940 a and 940 b through which the second right guide 850 b penetrates.

The guides 850 a, 850 b, 850 c, and 850 d may include locking protrusions 852 a and 852 b. The locking protrusions 852 a and 852 b may include a right locking protrusion 852 a disposed on the right side of the motor assembly 810 and a left locking protrusion 852 b disposed on the left side of the motor assembly 810.

The right locking protrusion 852 a may be disposed between the right slider 860 a and the second right bearing 830 b. Furthermore, the second right spring 851 a may be disposed between the right slider 860 a and the second right bearing 830 b. One end of the second right spring 851 a may be brought into contact with or separated from the right slider 860 a. The other end of the second right spring 851 a may be brought into contact with or separated from the right locking protrusion 852 a.

If the second arm 912 a has fully lain down with respect to the base 31, the distance between the right slider 860 a and the right locking protrusion 852 a may be a distance RD4. The second right spring 851 a may have a length greater than the distance RD4 in the state in which it has not been compressed or extended. Accordingly, if the second arm 912 a has fully lain down with respect to the base 31, the second right spring 851 a may be compressed between the right slider 860 a and the right locking protrusion 852 a. Furthermore, the second right spring 851 a may provide a restoring force to the right slider 860 a in the +x-axis direction.

If the second arm 912 a changes from the state in which it has fully lain down with respect to the base 31 to the standing state, a restoring force provided by the second right spring 851 a may assist the second arm 912 a to stand up. A load of the motor assembly 810 can be reduced because the second right spring 851 a assists the second arm 912 a to stand up.

The lead screws 840 a and 840 b may be driven by the single motor assembly 810. Since the lead screws 840 a and 840 b are driven by the single motor assembly 810, the second arms 912 a and 912 b can stand up while forming symmetry. If the lead screws 840 a and 840 b are driven by the single motor assembly 810, however, a load applied to the motor assembly 810 in order to stand the second arms 912 a and 912 b may be excessively increased. In this case, since the second right spring 851 a assists the second arm 912 a to stand up, a load of the motor assembly 810 can be reduced and a load applied to the motor assembly 810 in order to stand the second arm 912 a can be reduced.

Alternatively, if the second arm 912 a changes from the state in which it has fully stood up with respect to the base 31 to the state in which it has fully lain down, a restoring force provided by the second right spring 851 a can reduce an impact generated when the second arm 912 a lies down with respect to the base 31. That is, when the second arm 912 a lies down with respect to the base 31, the second right spring 851 a plays the role of a damper. A load of the motor assembly 810 can be reduced because the second right spring 851 a plays the role of a damper.

A structure formed by the second left spring 851 b, the left locking protrusion 852 b, the left slider 860 b, the left guides 850 c and 850 d, and the second arm 912 a may be symmetrical to the structure formed by the second right spring 851 a, the right locking protrusion 852 a, the right slider 860 a, the right guides 850 a and 850 b, and the second arm 912 a. In this case, the symmetry axis may be the symmetry axis “ys” of the motor assembly 810.

Referring to FIGS. 79 to 81, the second arm 912 a may stand up by restoring forces provided by the first right spring 841 a and the second right spring 851 a.

An angle formed by the second arm 912 a and the base 31 may be called “theta S.” An angle formed by the right rod 870 a and the base 31 may be called “theta T.” A force by which the motor assembly 810 moves the right slider 860 a to the +x-axis direction may be called FA. A force that is applied from the first right spring 841 a to the right slider 860 a may be called FB. A force that is applied from the second right spring 851 a to the right slider 860 a may be called FC. A force that is transferred from the right rod 870 a to the second arm 912 a may be called FT.

If the second arm 912 a has fully lain down with respect to the base 31, the angle “theta S” and the angle “theta T” may have a minimum value. If the second arm 912 a changes from the state in which it has fully lain down with respect to the second base 31 to the standing state, the angle “theta S” and the angle “theta T” may gradually increase.

If the second arm 912 a has fully lain down with respect to the base 31, the first right spring 841 a may be compressed. The compressed first right spring 841 a may provide the restoring force FB to the right slider 860 a. The restoring force FB may act in the +x direction. If the second arm 912 a has fully lain down with respect to the base 31, compression displacement of the first right spring 841 a may be a maximum, and the restoring force FB may have a maximum value. If the second arm 912 a changes from the state in which it has fully lain down with respect to the base 31 to the standing state, compression displacement of the first right spring 841 a may be gradually decreased, and the amount of the restoring force FB may be gradually decreased.

If the second arm 912 a has fully lain down with respect to the base 31, the second right spring 851 a may be compressed. The compressed second right spring 851 a may provide the restoring force FC to the right slider 860 a. The restoring force FC may act in the +x direction. If the second arm 912 a has fully lain down with respect to the base 31, compression displacement of the second right spring 851 a may be a maximum, and the restoring force FC may have a maximum value. If the second arm 912 a changes from the state in which it has fully lain down with respect to the base 31 to the standing state, compression displacement of the second right spring 851 a may be gradually decreased, and the amount of the restoring force FC may be gradually decreased.

The force FT that is transferred from the right rod 870 a to the second arm 912 a may be the resultant force of the force FA by which the motor assembly 810 moves the right slider 860 a to the +x-axis direction, the restoring force FB of the first right spring 841 a, and the restoring force FC of the second right spring 851 a.

If the second arm 912 a starts to stand up in the state in which the second arm 912 a has fully lain down with respect to the base 31, a load of the motor assembly 810 may be a maximum. In this case, the restoring force FB provided by the first right spring 841 a may be a maximum. Furthermore, the restoring force FC provided by the second springs 851 a and 851 b may be a maximum.

If the second arm 912 a changes from the state in which it has fully lain down with respect to the base 31 to the standing state, the restoring forces provided by the first right spring 841 a and the second right spring 851 a may assist the second arm 912 a to stand up. A load of the motor assembly 810 can be reduced because the first right spring 841 a and the second right spring 851 a assist the second arm 912 a to stand up.

The first right spring 841 a and the second right spring 851 a may provide restoring forces (i.e., the resultant force of the restoring force FB and the restoring force FC) to the right slider 860 a at the same time. The restoring forces (i.e., the resultant force of the restoring force FB and the restoring force FC) may be provided to the right slider 860 a until a distance RD5 between the right slider 860 a and the right locking protrusion 852 a becomes equal to the length of the second right spring 851 a.

When the distance RD5 between the right slider 860 a and the right locking protrusion 852 a becomes equal to the length of the second right spring 851 a, compression displacement of the second right spring 851 a may become 0. When compression displacement of the second right spring 851 a becomes 0, the restoring force FC that is provided from the second right spring 851 a to the right slider 860 a may become 0.

If the distance RD5 between the right slider 860 a and the right locking protrusion 852 a becomes greater than the length of the second right spring 851 a, only the first right spring 841 a may provide the restoring force FB to the right slider 860 a. The restoring force FB may be provided to the right slider 860 a until a distance RD6 between the right slider 860 a and the second right bearing 830 b becomes equal to the length of the first right spring 841 a.

When the distance RD6 between the right slider 860 a and the second right bearing 830 b becomes equal to the first right spring 841 a, compression displacement of the first right spring 841 a may become 0. When compression displacement of the first right spring 841 a becomes 0, the restoring force FB that is provided from the first right spring 841 a to the right slider 860 a may become 0.

When the distance RD6 between the right slider 860 a and the second right bearing 830 b becomes greater than the length of the first right spring 841 a, the motor assembly 810 may stand the second arm 912 a without using a restoring force provided by the first right spring 841 a or the second right spring 851 a.

A structure formed by the first left spring 841 b, the second left spring 851 b, the left locking protrusion 852 b, the left slider 860 b, the left guides 850 c and 850 d, the left lead screw 840 b, the left rod 870 b, and the second arm 912 a may be symmetrical to the structure formed by the first right spring 841 a, the second right spring 851 a, the right locking protrusion 852 a, the right slider 860 a, the right guides 850 a and 850 b, the right lead screw 840 a, the right rod 870 a, and the second arm 912 a. In this case, the symmetry axis may be the symmetry axis “ys” of the motor assembly 810.

Referring to FIG. 82, pushers 930 a and 930 b may be connected to the link mounts 920 a and 920 b. The pushers 930 a and 930 b may include a right pusher 930 a disposed on the right side of the motor assembly 810 and a left pusher 930 b disposed on the left side of the motor assembly 810. The pushers 930 a and 930 b may be referred to herein as elastic members.

The link mounts 920 a and 920 b may form an accommodation space A. The accommodation space A may accommodate springs 940 a and 940 b and the pushers 930 a and 930 b. The springs 940 a and 940 b may include the right spring 940 a disposed on the right side of the motor assembly 810 and the left spring 940 b disposed on the left side of the motor assembly 810. The accommodation space A may also be referred to as an internal space A.

The link mount 920 a and 920 b may include a first hole 922 a (e.g., a first hole for the link mounts 920 a and 920 b) that connects the accommodation space A and an external space. The first hole 922 a may be formed in the top surface of the link mounts 920 a and 920 b. The first hole 922 a may also be referred to as a hole 922 a.

The pushers 930 a and 930 b may be disposed in a direction vertical to the base 31. Alternatively, the pushers 930 a and 930 b may be disposed in parallel to the y axis. The springs 940 a and 940 b may be located in a direction vertical to the base 31. Alternatively, the springs 940 a and 940 b may be disposed in a direction parallel to the y axis.

The pushers 930 a and 930 b may include first parts 931 a and 931 b and second parts 932 a and 932 b, respectively. The second parts 932 a and 932 b may be connected to the lower sides of the first parts 931 a and 931 b. The bottoms of the second parts 932 a and 932 b may be connected to the springs 940 a and 940 b. Some of or the entire second parts 932 a and 932 b may be accommodated in the accommodation space A formed by the link mounts 920 a and 920 b. Each of the second parts 932 a and 932 b may have the same diameter as the first hole 922 a or may have a smaller diameter than the first hole 922 a. The second parts 932 a and 932 b may pass through the first hole 922 a.

The first parts 931 a and 931 b may be located outside the link mounts 920 a and 920 b. Alternatively, the first parts 931 a and 931 b may be located outside the accommodation space A of the link mounts 920 a and 920 b. Each of the first parts 931 a and 931 b may have a greater diameter than the first hole 922 a.

The first parts 931 a and 931 b may be brought into contact with an upper surface of the display screen. For example, the first parts 931 a and 931 b may contact the upper bar and/or the link brackets 951 a and 951 b or may be spaced apart from each other. For example, if the second arms 912 a and 912 b have fully lain down with respect to the base 31, the first parts 931 a and 931 b may come into contact with the link brackets 951 a and 951 b. Alternatively, if the second arms 912 a and 912 b have fully stood up with respect to the base 31, the first parts 931 a and 931 b may be spaced apart from the link brackets 951 a and 951 b.

If the first parts 931 a and 931 b come into contact with the link brackets 951 a and 951 b, forces from the link brackets 951 a and 951 b may be applied to the pushers 930 a and 930 b. The forces applied to the pushers 930 a and 930 b may be downward. Alternatively, the forces applied to the pushers 930 a and 930 b may be the −y-axis direction. Alternatively, the link brackets 951 a and 951 b may pressurize the pushers 930 a and 930 b. The direction in which the link brackets 951 a and 951 b pressurize the pushers 930 a and 930 b may be downward. Alternatively, the direction in which the link brackets 951 a and 951 b pressurize the pushers 930 a and 930 b may be the −y-axis direction.

When the forces are applied to the first parts 931 a and 931 b, the springs 940 a and 940 b may be compressed. The compressed springs 940 a and 940 b may provide restoring forces to the pushers 930 a and 930 b. The restoring forces may have a direction opposite the direction in which the forces are applied to the first parts 931 a and 931 b. Alternatively, the restoring force may act in the +y-axis direction.

The link mount 920 a and 920 b may include a second hole 921 a (e.g., a second hole for the link mounts 920 a and 920 b). The second hole 921 a may connect the accommodation space A and an external space. Some of or the entire springs 940 a and 940 b may be exposed to the outside through the second hole 921 a. Some of or the entire pushers 930 a and 930 b may be exposed to the outside through the second hole 921 a. When the display device is to be maintained or repaired, a service provider may check the operating state of the pushers 930 a and 930 b through the second hole 921 a. The second hole 921 a may provide a service provider with maintenance or repair convenience.

Referring to FIGS. 83 to 85, the right link 910 a may stand up by the restoring force provided by the right pusher 930 a. The right link 910 a is described below, for example.

An angle formed by the second arm 912 a and the base 31 may be called “theta S.” A force that is transferred from the right rod 870 a to the second arm 912 a may be called FT. A force that is transferred from the right pusher 930 a to the right link bracket 951 a may be called FP.

Referring to FIG. 83, if the second arm 912 a has fully lain down with respect to the base 31, the angle “theta S” may have a minimum value. The right spring 940 a connected to the right pusher 930 a may be compressed to as much as possible, and the amount of the restoring force FP may have a maximum value. The compressed right spring 940 a may provide the restoring force FP to the right pusher 930 a. The right pusher 930 a may transfer the restoring force FP to the right link bracket 951 a. The restoring force FP may act in the +y-axis direction.

If the second arm 912 a has fully lain down with respect to the base 31, the distance HL from the base 31 to the top of the right pusher 930 a may have a minimum value. The first part 931 a of the right pusher 930 a may protrude to the outside the right link mount 920 a. The second part 932 a of the right pusher 930 a may be fully accommodated in the accommodation space 923 a of the right link mount 920 a.

Referring to FIG. 84, if the second arm 912 a changes from the state in which it has fully lain down with respect to the base 31 to the standing state, the angle “theta S” may gradually increase. Compression displacement of the right spring 940 a may be gradually decreased, and the amount of the restoring force FP may gradually decrease.

As the angle “theta S” gradually increases, at least part of the second part 932 a of the right pusher 930 a may be protruded to the outside of the right link mount 920 a. The length in which the second part 932 a of the right pusher 930 a has protruded to the outside of the right link mount 920 a may be referred to as HP. The distance HL from the base 31 to the top of the right pusher 930 a may be increased by the length HP compared to a case where the second arm 912 a has fully lain down with respect to the base 31.

Referring to FIG. 85, when the standing up of the second arm 912 a with respect to the base 31 is in progress, the right pusher 930 a and the right link bracket 951 a may be separated from each other. In this case, compression displacement of the right spring 940 a may become 0. When compression displacement of the right spring 940 a becomes 0, the restoring force FP that is provided from the right pusher 930 a to the right link bracket 951 a may become 0. For example, the right pusher 930 a may extend initially and a fraction of a total distance in which the arms 911 a and 912 a must move to fully extend the flexible display. As illustrated, for example, in FIG. 61, a length of the first portion 931 a in the vertical direction is smaller than a height of the link mount 920 a in the vertical direction such that the first portion 931 a no longer makes contact after the initial phase of the movement.

Furthermore, the length HP in which the second part 932 a of the right pusher 930 a has protruded to the outside of the right link mount 920 a may have a maximum value. Furthermore, the distance HL from the base 31 to the top of the right pusher 930 a may have a maximum value.

That is, while the right pusher 930 a comes into contact with the right link bracket 951 a, the restoring force may be applied to the right link bracket 951 a. Accordingly, the restoring force can assist the second arm 912 a to stand up and can reduce a load of the motor assembly 810.

The lead screws 840 a and 840 b may be driven by the single motor assembly 810. Since the lead screws 840 a and 840 b are driven by the single motor assembly 810, the second arms 912 a and 912 b can stand up while forming symmetry. If the lead screws 840 a and 840 b are driven by the single motor assembly 810, however, a load applied to the motor assembly 810 in order to stand the second arms 912 a and 912 b may be excessively increased. In this case, since the right pusher 930 a applies the restoring force to the right link bracket 951 a, the restoring force can assist the second arm 912 a to stand up and can reduce a load of the motor assembly 810.

Alternatively, if the second arm 912 a changes from the state in which it has stood up with respect to the base 31 to the state in which it has fully lain down, the restoring force that is provided from the right pusher 930 a to the right link bracket 951 a can reduce an impact generated when the link 910 a lies down with respect to the base 31. That is, the restoring force that is provided from the right pusher 930 a to the right link bracket 951 a plays the role of a damper when the link 910 a lies down with respect to the base 31. A load of the motor assembly 810 can be reduced because the right pusher 930 a plays the role of a damper.

A structure formed by the left pusher 930 b, the left spring 940 b, the left link bracket 951 b, the left link mount 920 b, and the left rod 870 b may be symmetrical to the structure formed by the right pusher 930 a, the right spring 940 a, the right link bracket 951 a, the right link 910 a, and the right rod 870 a. In this case, the symmetry axis may be the symmetry axis “ys” of the motor assembly 810.

Referring to FIGS. 86 to 88, the panel roller 143 may be installed on the base 31. The panel roller 143 may be disposed at the front of the lead screws 840 a and 840 b. Alternatively, the panel roller 143 may be disposed in parallel to the length direction of the lead screws 840 a and 840 b. Alternatively, the panel roller 143 may be spaced apart from the lead screws 840 a and 840 b.

The display portion 20 may include the display panel 10 and the module cover 15. The lower side of the display portion 20 may be connected to the panel roller 143, and the upper side of the display portion 20 may be connected to the upper bar 75. The display portion 20 may be wound on or unwound from the panel roller 143.

A distance from the symmetry axis “ys” of the motor assembly 810 to the right slider 860 a may be called a distance RD. A distance from the symmetry axis “ys” of the motor assembly 810 to the left slider 860 b may be called a distance LD. The distance between the right slider 860 a and the left slider 860 b may be called a distance SD. The distance SD may be the sum of the distance RD and the distance LD. A distance from the base 31 to the top of the display portion 20 may be called a distance HD.

Referring to FIG. 86, if the second arms 912 a and 912 b have fully lain down with respect to the base 31, the distance SD between the right slider 860 a and the left slider 860 b may have a minimum value. The distance RD from the symmetry axis “ys” of the motor assembly 810 to the right slider 860 a and the distance LD from the symmetry axis “ys” of the motor assembly 810 to the left slider 860 b may be the same.

If the second arms 912 a and 912 b have fully lain down with respect to the base 31, the distance HD from the base 31 to the top of the display portion 20 may have a minimum value.

If the second arms 912 a and 912 b have fully lain down with respect to the base 31, the first springs 841 a and 841 b may come into contact with the sliders 860 a and 860 b. Furthermore, the second springs 851 a and 851 b may come into contact with the sliders 860 a and 860 b. Furthermore, the pushers 930 a and 930 b may come into contact with the link brackets 951 a and 951 b.

If the second arms 912 a and 912 b have fully lain down with respect to the base 31, the amount of compression of the first springs 841 a and 841 b may have a maximum value and the amount of restoring forces provided from the first springs 841 a and 841 b to the sliders 860 a and 860 b may have a maximum value.

If the second arms 912 a and 912 b have fully lain down with respect to the base 31, the amount of compression of the second springs 851 a and 851 b may have a maximum value and the amount of restoring forces provided from the second springs 851 a and 851 b to the sliders 860 a and 860 b may have a maximum value.

If the second arms 912 a and 912 b have fully lain down with respect to the base 31, the amount of compression of the springs 940 a and 940 b may have a maximum value and the amount of restoring forces provided from the springs 940 a and 940 b to the pushers 930 a and 930 b may have a maximum value.

If the second arms 912 a and 912 b start to stand up with respect to the base 31, the second arms 912 a and 912 b may stand up using the restoring forces provided by the first springs 841 a and 841 b, the second springs 851 a and 851 b, and the springs 940 a and 940 b. Accordingly, a load applied to the motor assembly 810 can be reduced.

Referring to FIG. 87, as the standing up of the second arms 912 a and 912 b with respect to the base 31 is in progress, the distance SD between the right slider 860 a and the left slider 860 b may gradually increase. Although the distance SD increases, the distance LD and the distance RD may be the same. That is, the right slider 860 a and the left slider 860 b may be located while forming symmetry based on the symmetry axis “ys” of the motor assembly 810. Furthermore, the degree that the second arms 912 a and 912 b of the right link 910 a stands up with respect to the base 31 and the degree that the second arms 912 a and 912 b of the left link 910 b stand up with respect to the base 31 may be the same.

As the standing up of the second arms 912 a and 912 b with respect to the base 31 is in progress, the distance HD from the base 31 to the top of the display portion 20 may gradually increase. The display portion 20 may be unwound from the panel roller 143. Alternatively, the display portion 20 may be unfolded from the panel roller 143.

When the second arms 912 a and 912 b sufficiently stand up with respect to the base 31, the first springs 841 a and 841 b may be separated from the sliders 860 a and 860 b. Furthermore, when the second arms 912 a and 912 b sufficiently stand up with respect to the base 31, the second springs 851 a and 851 b may be separated from the sliders 860 a and 860 b. Furthermore, when the second arms 912 a and 912 b sufficiently stand up with respect to the base 31, the pushers 930 a and 930 b may be separated from the link brackets 951 a and 951 b.

The separation of the first springs 841 a and 841 b from the sliders 860 a and 860 b, the separation of the second springs 851 a and 851 b from the sliders 860 a and 860 b, and the separation of the pushers 930 a and 930 b from the link brackets 951 a and 951 b may be independently performed. That is, the sequence of the separation of the first springs 841 a and 841 b from the sliders 860 a and 860 b, the separation of the second springs 851 a and 851 b from the sliders 860 a and 860 b, and the separation of the pushers 930 a and 930 b from the link brackets 951 a and 951 b may be varied.

An angle formed by an axis “xs1” parallel to the base 31 and the second arm 912 a may be referred to as “theta R.” Furthermore, an angle formed by the axis “xs1” parallel to the base 31 and the first arm 911 a may be referred to as theta R′. The axis “xs1” and the x axis may be parallel.

If the second arm 912 a has fully lain down with respect to the base 31 or while the second arm 912 a stands up with respect to the base 31 or if the standing up of the second arm 912 a with respect to the base 31 has been completed, the angle “theta R” and the angle theta R′ may remain identical.

An angle formed by an axis “xs2” parallel to the base 31 and the second arm 912 b may be referred to as “theta L.”. Furthermore, an angle formed by the axis “xs2” parallel to the base 31 and the first arm 911 b may be referred to as theta L′. The axis “xs2” and the x axis may be parallel.

If the second arm 912 b has fully lain down with respect to the base 31 or while the second arm 912 b stands up with respect to the base 31 or if the standing up of the second arm 912 b with respect to the base 31 has been completed, the angle “theta L” and the angle theta L′ may remain identical.

The axis “xs1” and the axis “xs2” may be the same axis.

Referring to FIG. 88, when the second arms 912 a and 912 b fully stand up with respect to the base 31, the distance SD between the right slider 860 a and the left slider 860 b may have a maximum value. Although the distance SD is a maximum, the distance LD and the distance RD may be the same.

When the second arms 912 a and 912 b fully stand up with respect to the base 31, the distance HD from the base 31 to the top of the display portion 20 may have a maximum value.

The aforementioned embodiments of the present disclosure are not mutually exclusive and distinct from each other. In the aforementioned embodiments of the present disclosure, elements or functions may be used in combination or combined.

In the aforementioned drawings, the structure of the display device in which the display portion is rolled up from the inside of the housing has been illustrated, but the present disclosure is not limited thereto. The present disclosure may be applied to the structure of a display device in which the display portion is rolled down from the inside of the housing.

A display device according to an embodiment of the present disclosure includes a housing, a flexible display having an upper surface, a lift assembly provided in the housing and coupled to the upper surface of the flexible display screen to extend the flexible display screen outside the housing, a motor provided in the housing and coupled to the lift assembly to raise the flexible display screen, and an elastic member provided adjacent to the upper surface of the flexible display screen, the elastic member configured to apply a vertical force to the upper surface of the flexible display screen.

The flexible display may be an OLED display configured to be rolled and stored in the housing.

The lift assembly may include a left lever assembly provided on a left side of the housing and a right lever assembly provided on a right side of the housing.

The motor may be provided between the left lever assembly and the right lever assembly and coupled to simultaneously raise the left and right lever assemblies.

The left and right lever assemblies may include a first arm coupled to the upper portion of the flexible display, a second arm coupled between the first arm and the housing. The first arm and the second arm may be folded when the flexible display is fully retracted in the housing and the first arm and the second arm are vertically aligned when the flexible display is fully extended.

The lift assembly may include a screw rod rotatably coupled to the motor, a pair of screw nuts in moveable engagement with the screw rod and configured to laterally move in opposite directions. The pair of screw nuts may be coupled to the left and right arm assemblies to raise the left and right lever assemblies.

The motor may rotate the screw rod to simultaneously raise both the left and right lever assemblies.

The upper surface of the flexible display may be engaged with the elastic member when the flexible display is fully retracted in the housing.

The elastic member may have a body and a protruding member that extends from the body.

The elastic member may be configured to extend a prescribed distance from a compressed state to an extended state.

The elastic member may apply the vertical force to the upper surface of the flexible display for the prescribed distance when the flexible display is fully retracted in the housing.

An upper portion of the elastic member may be positioned inside the housing when the elastic member is fully extended.

The elastic member may include a left elastic member and a right elastic member. The left elastic member may be provided at a left side of the housing to apply a vertical force at a left side of the upper surface of the flexible display. The right elastic member may be provided at a right side of the housing to apply a vertical force at a right side of the upper surface of the flexible display.

The foregoing embodiments are merely examples and are not to be considered as limiting the present disclosure. The present teachings can be readily applied to other types of methods and apparatuses. The features, structures, methods, and other characteristics of the embodiments described herein may be combined in various ways to obtain additional and/or alternative embodiments.

Certain embodiments or other embodiments of the invention described above are not mutually exclusive or distinct from each other. Any or all elements of the embodiments of the invention described above may be combined or combined with each other in configuration or function.

For example, a configuration “A” described in one embodiment of the invention and the drawings and a configuration “B” described in another embodiment of the invention and the drawings may be combined with each other. Namely, although the combination between the configurations is not directly described, the combination is possible except in the case where it is described that the combination is impossible.

Although embodiments have been described with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the scope of the principles of this disclosure. More particularly, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure, the drawings and the appended claims. In addition to variations and modifications in the component parts and/or arrangements, alternative uses will also be apparent to those skilled in the art. 

What is claimed is:
 1. A display device, comprising: a housing; a roller located within the housing; a display panel comprising a front surface and a rear surface; and a plate coupled to the back surface of the display panel and comprising an opening, wherein the display panel and the plate are wound on the roller, wherein the plate further comprises a plurality of openings arranged in a plurality of rows which are aligned along a longitudinal direction of the roller, and wherein positions of openings of a first row are offset with respect to positions of openings of a second row adjacent to the first row such that adjacent openings of the first row are separated by plate material which is vertically aligned with a center of an opening of the adjacent second row.
 2. The display device of claim 1, wherein the plate comprises a metal material.
 3. The display device of claim 1, wherein the plurality of rows are separated by rows of plate material each having a same height, wherein adjacent rows of plate material are connected by bars of plate material separating the plurality of openings.
 4. The display device of claim 1, wherein: the plurality of openings are elongated slits; and a first length of a first opening of the first row of the plurality of rows is greater than a second length of the second opening of an adjacent second row of the plurality of rows.
 5. The display device of claim 1, wherein sizes of openings of a first row of the plurality of rows are the same as sizes of openings of an adjacent second row of the plurality of rows.
 6. The display device of claim 1, wherein the plurality of openings form a pattern such that corresponding bars of plate material between corresponding openings in every other row of the plurality of rows are vertically aligned.
 7. The display device of claim 1, wherein each of the plurality of openings is rectangularly shaped.
 8. The display device of claim 1, wherein each of the plurality of openings is an elongated slit formed to be elongated in a direction parallel to the roller.
 9. The display device of claim 1, wherein the rear surface of the display panel and the plate are coupled via an adhesive layer.
 10. The display device of claim 1, wherein the plate and the display panel are wound on the roller in a direction such that a rear surface of the plate is positioned toward the roller.
 11. The display device of claim 1, wherein plate and the display panel are wound on the roller in a direction such that the front surface of the display panel is positioned toward the roller.
 12. The display device of claim 1, further comprising a first resin layer disposed at a rear surface of the plate which covers the opening of the plate.
 13. The display device of claim 12, wherein: each of the plurality of openings is an elongated slit formed to be elongated in a direction parallel to the roller; the first resin layer is flexible and configured to be wound on the roller; and each of the plurality of openings is filled in by the first resin layer, wherein the plate and the display panel are wound on the roller in a direction such that the first resin layer is positioned toward the roller.
 14. The display device of claim 12, wherein the first resin layer is configured to cover the entire plate such that the plate is not externally exposed.
 15. The display device of claim 12, further comprising a second resin layer disposed at the rear surface of the display panel, wherein the plate is disposed between the first resin layer and the second resin layer.
 16. The display device of claim 12, wherein the first resin layer comprises a urethane or rubber material.
 17. A display device comprising: a housing; a roller located within the housing; a display panel comprising a front surface and a rear surface; and a plate coupled to the back surface of the display panel and comprising an opening, wherein: the display panel and the plate are wound on the roller; the plate further comprises a plurality of openings arranged in a plurality of rows which are aligned along a longitudinal direction of the roller; the plurality of openings are elongated slits; a first opening disposed at an end of a first row of the plurality of rows is open-ended toward a lateral edge of the plate; and a second opening disposed at an end of a second row adjacent to the first row is open-ended toward the lateral edge of the plate, wherein a length of the first opening is greater than a length of the second opening.
 18. The display device of claim 17, wherein the plate comprises a metal material.
 19. A display device comprising: a housing; a roller located within the housing; a display panel comprising a front surface and a rear surface; and a plate coupled to the back surface of the display panel and comprising an opening, wherein: the plate further comprises a plurality of openings arranged in a plurality of rows; positions of openings of a first row are offset with respect to positions of openings of a second row adjacent to the first row; and a first bar of plate material between a first opening and a second opening of the first row is vertically aligned with a second bar of plate material between a third opening and a fourth opening of a third row, wherein the second row is between the first row and the third row.
 20. The display device of claim 19, wherein the plate comprises a metal material. 